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Derivative Instruments - Additional Information (Details)
1 Months Ended 9 Months Ended
Jul. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
tranche
Sep. 30, 2018
USD ($)
Jul. 31, 2014
USD ($)
Derivative [Line Items]        
Net derivative gains to be reclassified into earnings within the next 12 months   $ 62,000,000    
Repayments of debt   1,550,000,000 $ 750,000,000  
Offset asset   15,000,000    
Offset liability   0    
Net derivative assets   92,000,000    
Net derivative liabilities   $ 0    
Foreign Exchange Contract | Designated as Hedging Instrument | Minimum        
Derivative [Line Items]        
Derivative contract duration   1 month    
Foreign Exchange Contract | Designated as Hedging Instrument | Maximum        
Derivative [Line Items]        
Derivative contract duration   1 year    
Foreign Exchange Contract | Designated as Hedging Instrument | Maximum | Cash Flow Hedging        
Derivative [Line Items]        
Derivative contract duration   24 months    
Interest Rate Swap | Designated as Hedging Instrument | Fair Value Hedging        
Derivative [Line Items]        
Derivative liability $ 2,400,000,000     $ 2,400,000,000
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    
2.200% Senior notes due 2019 | Senior Notes        
Derivative [Line Items]        
Repayments of debt $ 1,150,000,000      
interest rate (in percentage) 2.20% 2.20%    
2.875% Senior notes due 2021 | Senior Notes        
Derivative [Line Items]        
interest rate (in percentage) 2.875% 2.875%    
Debt instrument, face amount $ 750,000,000 $ 750,000,000    
3.450% Senior notes due 2024 | Senior Notes        
Derivative [Line Items]        
interest rate (in percentage) 3.45% 3.45%    
Debt instrument, face amount $ 500,000,000 $ 500,000,000