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Derivative Instruments - Additional Information (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
tranche
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
Jul. 31, 2014
USD ($)
Derivative [Line Items]          
Derivative, notional amount $ 5,917,000,000   $ 4,622,000,000    
Foreign currency net derivative gains to be reclassified into earnings within the next 12 months 4,000,000        
Interest rate net derivative losses to be reclassified into earnings within the next 12 months 1,000,000        
Repayments of debt $ 839,000,000 $ 0      
Senior Notes          
Derivative [Line Items]          
Debt instrument, face amount       $ 1,000,000,000  
Senior Notes | 2.200% Senior notes due 2019          
Derivative [Line Items]          
Repayments of debt     $ 1,150,000,000    
Interest rate     2.20%    
Senior Notes | 2.875% Senior notes due 2021          
Derivative [Line Items]          
Interest rate 2.875%   2.875%    
Debt instrument, face amount     $ 750,000,000    
Senior Notes | 3.450% Senior notes due 2024          
Derivative [Line Items]          
Interest rate 3.45%   3.45%    
Debt instrument, face amount     $ 500,000,000    
Foreign Exchange Contract          
Derivative [Line Items]          
Offset asset $ 24,000,000        
Offset liability 24,000,000        
Net derivative assets 71,000,000        
Net derivative liabilities $ 5,000,000        
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 $ 1,000,000        
Net derivative assets 0        
Net derivative liabilities $ 3,000,000        
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 $ 2,022,000,000   1,983,000,000    
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        
Derivative, notional amount $ 700,000,000        
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 Swap | Fair Value Hedging          
Derivative [Line Items]          
Derivative liability     2,400,000,000   $ 2,400,000,000
Designated as Hedging Instrument | Interest Rate Contract | Cash Flow Hedging          
Derivative [Line Items]          
Derivative, notional amount $ 1,100,000,000   $ 0