Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Oct. 17, 2013
Assets and Liabilities Measured at Fair Value        
Realized and unrealized gains (losses) on financial instruments, net $ 40 $ (88) $ 37  
1.375% Cash Convertible Senior Notes Due 2023        
Assets and Liabilities Measured at Fair Value        
Debt instrument interest rate 1.375%     1.375%
Debt and equity securities        
Assets and Liabilities Measured at Fair Value        
Realized and unrealized gains (losses) on financial instruments, net $ 2 (36) 112  
Debt measured at fair value        
Assets and Liabilities Measured at Fair Value        
Realized and unrealized gains (losses) on financial instruments, net 130 (126) (113)  
Bond Hedge Change in Fair Value | Level 2        
Assets and Liabilities Measured at Fair Value        
Realized and unrealized gains (losses) on financial instruments, net (94) 72 37  
Other derivatives        
Assets and Liabilities Measured at Fair Value        
Realized and unrealized gains (losses) on financial instruments, net $ 2 $ 2 $ 1