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Debt - Unsecured Senior Notes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 04, 2020
Aug. 05, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Debt Instrument [Line Items]              
Amount outstanding     $ 3,650   $ 3,650   $ 2,700
Amount of new debt raised         1,994 $ 0  
Debt discount and financing costs     46   46   $ 25
Loss on extinguishment of debt     $ 31 $ 0 $ 31 $ 0  
Unsecured Debt | Unsecured 2030 and 2050 Notes              
Debt Instrument [Line Items]              
Amount of new debt raised   $ 2,000          
Debt discount and financing costs   $ 26          
Unsecured Debt | Unsecured 2030 and 2050 Notes | Debt Instrument, Redemption, Period One              
Debt Instrument [Line Items]              
Redemption price percentage         100.00%    
Unsecured Debt | Unsecured 2030 and 2050 Notes | Debt Instrument, Redemption, Period Two              
Debt Instrument [Line Items]              
Redemption price percentage         100.00%    
Unsecured Debt | Unsecured 2021 and 2022 Notes              
Debt Instrument [Line Items]              
Redemption price percentage 100.00%            
Make-whole premium $ 28            
Loss on extinguishment of debt $ 31