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Stockholders' Equity - New Accounting Pronouncements (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Equity $ 31,838 $ 34,086 $ 34,531 $ 35,124
Impact of Adoption of ASU        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Equity     (4) 66
Accumulated deficit        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Equity (9,936) (7,693) (7,716) (7,754)
Accumulated deficit | Impact of Adoption of ASU        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Equity     (4) 175
Accumulated other comprehensive loss        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Equity $ (407) $ (333) $ (330) (541)
Accumulated other comprehensive loss | Impact of Adoption of ASU        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Equity       (109)
Accounting Standards Update 2017-05 | Accumulated deficit | Impact of Adoption of ASU        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Equity       66
Accounting Standards Update 2018-02 | Accumulated deficit | Impact of Adoption of ASU        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Equity       109
Accounting Standards Update 2018-02 | Accumulated other comprehensive loss | Impact of Adoption of ASU        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Equity       $ (109)