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Quarterly report pursuant to Section 13 or 15(d)

Assets And Liabilities Measured At Fair Value - Realized and Unrealized Gains (Losses) on Financial Instruments (Details)

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Assets And Liabilities Measured At Fair Value - Realized and Unrealized Gains (Losses) on Financial Instruments (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Oct. 17, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý Ìý Ìý
Realized and unrealized gains (losses) on financial instruments, net $ (31) $ 18 $ 180 $ (43) Ìý
1.375% Cash Convertible Senior Notes Due 2023 Ìý Ìý Ìý Ìý Ìý
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý Ìý Ìý
Debt instrument interest rate 1.375% Ìý 1.375% Ìý 1.375%
Marketable Securities Ìý Ìý Ìý Ìý Ìý
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý Ìý Ìý
Realized and unrealized gains (losses) on financial instruments, net $ (25) 56 $ 133 76 Ìý
Debt measured at fair value Ìý Ìý Ìý Ìý Ìý
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý Ìý Ìý
Realized and unrealized gains (losses) on financial instruments, net 26 (42) (77) (236) Ìý
Bond Hedge Change in Fair Value Ìý Ìý Ìý Ìý Ìý
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý Ìý Ìý
Realized and unrealized gains (losses) on financial instruments, net (41) 6 76 130 Ìý
Other derivatives Ìý Ìý Ìý Ìý Ìý
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý Ìý Ìý Ìý
Realized and unrealized gains (losses) on financial instruments, net $ 9 $ (2) $ 48 $ (13) Ìý