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Quarterly report pursuant to Section 13 or 15(d)

Investments In Available-For-Sale Securities And Other Cost Investments (Available-for-sale Securities, Including Fair Value Option Securities Separately Aggregated, and Other Cost Investments) (Details)

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Investments In Available-For-Sale Securities And Other Cost Investments (Available-for-sale Securities, Including Fair Value Option Securities Separately Aggregated, and Other Cost Investments) (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Schedule of Investments [Line Items] Ìý Ìý Ìý
Investments in available-for-sale securities and other cost investments $ 1,099 Ìý $ 1,324
Proceeds from Sale of Available-for-sale Securities 247 12 Ìý
Other Investments [Member]
Ìý Ìý Ìý
Schedule of Investments [Line Items] Ìý Ìý Ìý
Investments in available-for-sale securities and other cost investments 38 Ìý 47
AFS and cost method investments
Ìý Ìý Ìý
Schedule of Investments [Line Items] Ìý Ìý Ìý
Investments in available-for-sale securities and other cost investments 62 Ìý 71
Barnes & Noble, Inc.
Ìý Ìý Ìý
Schedule of Investments [Line Items] Ìý Ìý Ìý
Sale of stock, ownership percentage of cost investment after transaction 2.00% Ìý Ìý
Percentage of shares sold 90.00% Ìý Ìý
Proceeds from Sale of Available-for-sale Securities 247 Ìý Ìý
Live Nation | Debt Securities
Ìý Ìý Ìý
Schedule of Investments [Line Items] Ìý Ìý Ìý
Investments in available-for-sale securities and other cost investments 24 Ìý 24
Fair Value Option Securities
Ìý Ìý Ìý
Schedule of Investments [Line Items] Ìý Ìý Ìý
Investments in available-for-sale securities and other cost investments 1,037 Ìý 1,253
Fair Value Option Securities | Time Warner Inc | Equity Securities
Ìý Ìý Ìý
Schedule of Investments [Line Items] Ìý Ìý Ìý
Investments in available-for-sale securities and other cost investments 320 Ìý 297
Fair Value Option Securities | Time Warner Cable Inc | Equity Securities
Ìý Ìý Ìý
Schedule of Investments [Line Items] Ìý Ìý Ìý
Investments in available-for-sale securities and other cost investments 339 Ìý 320
Fair Value Option Securities | Viacom, Inc. | Equity Securities
Ìý Ìý Ìý
Schedule of Investments [Line Items] Ìý Ìý Ìý
Investments in available-for-sale securities and other cost investments 279 Ìý 317
Fair Value Option Securities | Barnes & Noble, Inc. | Equity Securities
Ìý Ìý Ìý
Schedule of Investments [Line Items] Ìý Ìý Ìý
Investments in available-for-sale securities and other cost investments 25 Ìý 255
Fair Value Option Securities | Other AFS Equity Securities | Equity Securities
Ìý Ìý Ìý
Schedule of Investments [Line Items] Ìý Ìý Ìý
Investments in available-for-sale securities and other cost investments 47 Ìý 37
Fair Value Option Securities | Other AFS Debt Securities | Debt Securities
Ìý Ìý Ìý
Schedule of Investments [Line Items] Ìý Ìý Ìý
Investments in available-for-sale securities and other cost investments $ 27 Ìý $ 27