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Derivative Instruments - Additional Information (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
tranche
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2019
USD ($)
Jul. 31, 2019
USD ($)
Jul. 31, 2014
USD ($)
Derivatives, Fair Value [Line Items]            
Net derivative loss reclassified into earnings within next 12 months $ 2,000,000          
Repayments of debt 1,550,000,000 $ 750,000,000 $ 1,452,000,000      
Offset asset 25,000,000          
Offset liability 25,000,000          
Net derivative assets 43,000,000          
Net derivative liabilities $ 1,000,000          
Warrant            
Derivatives, Fair Value [Line Items]            
Percent of shares acquirable 5.00%          
Term 7 years          
Number of tranches | tranche 4          
Maximum number of tranches vesting per year | tranche 2          
Fair Value Hedging | Designated as Hedging Instrument | Interest Rate Swap            
Derivatives, Fair Value [Line Items]            
Derivative liability $ 2,400,000,000       $ 2,400,000,000 $ 2,400,000,000
Minimum | Foreign Exchange Contract            
Derivatives, Fair Value [Line Items]            
Derivative maturity 1 month          
Maximum | Foreign Exchange Contract            
Derivatives, Fair Value [Line Items]            
Derivative maturity 1 year          
Maximum | Cash Flow Hedging | Designated as Hedging Instrument | Foreign Exchange Contract            
Derivatives, Fair Value [Line Items]            
Derivative maturity 24 months          
Senior notes due 2019 | Senior Notes            
Derivatives, Fair Value [Line Items]            
Repayments of debt $ 1,150,000,000          
Interest rate per annum 2.20%       2.20%  
Senior notes due 2021 | Senior Notes            
Derivatives, Fair Value [Line Items]            
Interest rate per annum 2.875%     2.875% 2.875%  
Face amount       $ 750,000,000 $ 750,000,000  
Senior notes due 2024 | Senior Notes            
Derivatives, Fair Value [Line Items]            
Interest rate per annum 3.45%     3.45% 3.45%  
Face amount       $ 500,000,000 $ 500,000,000