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Quarterly report pursuant to Section 13 or 15(d)

Assets And Liabilities Measured At Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details)

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Assets And Liabilities Measured At Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Cash and cash equivalents $ 367 Ìý $ 367 Ìý
Realized and unrealized gains on financial instruments, net 64 135 222 173
Available-for-sale securities 1,244 Ìý 1,244 Ìý
Fair Value, Inputs, Level 1 [Member]
Ìý Ìý Ìý Ìý
Cash and cash equivalents 367 Ìý 367 Ìý
Available-for-sale securities 955 Ìý 955 Ìý
Fair Value, Inputs, Level 2 [Member]
Ìý Ìý Ìý Ìý
Cash and cash equivalents 0 Ìý 0 Ìý
Available-for-sale securities 289 Ìý 289 Ìý
Non-Strategic Securities [Member]
Ìý Ìý Ìý Ìý
Realized and unrealized gains on financial instruments, net 53 126 189 257
Other Financial Instruments [Member]
Ìý Ìý Ìý Ìý
Realized and unrealized gains on financial instruments, net $ 11 $ 9 $ 33 $ (84)