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Derivative Instruments - Narrative (Details)
9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
tranche
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Jul. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
USD ($)
Jul. 31, 2014
USD ($)
Derivative [Line Items]              
Derivative, notional amount $ 5,616,000,000   $ 4,459,000,000        
Foreign currency net derivative losses to be reclassified into earnings within the next 12 months 35,000,000            
Interest rate net derivative losses to be reclassified into earnings within the next 12 months 1,000,000            
Repayments of debt $ 1,771,000,000 $ 1,550,000,000          
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% 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 $ 15,000,000            
Offset liability 15,000,000            
Net derivative assets 41,000,000            
Net derivative liabilities $ 11,000,000            
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 $ 2,000,000            
Offset liability 2,000,000            
Net derivative assets 2,000,000            
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 $ 2,039,000,000   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