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Derivative Instruments - Narrative (Details)
9 Months Ended
Sep. 30, 2021
USD ($)
tranche
May 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Derivative [Line Items]      
Derivative, notional amount $ 8,752,000,000   $ 6,421,000,000
Foreign currency net derivative losses to be reclassified into earnings within the next 12 months 3,000,000    
Interest rate net derivative losses to be reclassified into earnings within the next 12 months 1,000,000    
Senior Notes      
Derivative [Line Items]      
Debt instrument, face amount   $ 2,500,000,000  
Senior Notes | Senior Unsecured Notes due 2026, 2031 and 2051      
Derivative [Line Items]      
Debt instrument, face amount   2,500,000,000  
Foreign Exchange Contract      
Derivative [Line Items]      
Offset asset 8,000,000    
Offset liability 8,000,000    
Net derivative assets 131,000,000    
Net derivative liabilities $ 0    
Forward-Starting Interest Rate Swap      
Derivative [Line Items]      
Deferred gain from termination of derivatives   $ 45,000,000  
Warrant      
Derivative [Line Items]      
Maximum percentage of acquired shares 5.00%    
Warrants term (years) 7 years    
Number of tranches | tranche 4    
Maximum number of tranches that can vest per year | tranche 2    
Interest Rate Contract      
Derivative [Line Items]      
Offset asset $ 0    
Offset liability 0    
Net derivative assets 0    
Net derivative liabilities $ 1,000,000    
Designated as Hedging Instrument | Foreign Exchange Contract | Minimum      
Derivative [Line Items]      
Derivative contract duration 1 month    
Designated as Hedging Instrument | Foreign Exchange Contract | Maximum      
Derivative [Line Items]      
Derivative contract duration 1 year    
Designated as Hedging Instrument | Foreign Exchange Contract | Cash Flow Hedging      
Derivative [Line Items]      
Derivative, notional amount $ 2,272,000,000   2,305,000,000
Designated as Hedging Instrument | Foreign Exchange Contract | Cash Flow Hedging | Maximum      
Derivative [Line Items]      
Derivative contract duration 24 months    
Designated as Hedging Instrument | Forward-Starting Interest Rate Swap | Cash Flow Hedging      
Derivative [Line Items]      
Derivative contract duration 10 years    
Designated as Hedging Instrument | Floating to Fixed Interest Rate Swap | Cash Flow Hedging      
Derivative [Line Items]      
Derivative, notional amount $ 400,000,000    
Designated as Hedging Instrument | Interest Rate Contract | Cash Flow Hedging      
Derivative [Line Items]      
Derivative, notional amount $ 400,000,000   $ 1,100,000,000