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Financial Instruments - Narrative (Details)
€ in Billions
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2020
EUR (€)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Derivative [Line Items]          
Notional value       $ 10,471,000,000 $ 12,112,000,000
Net Investment Hedging          
Derivative [Line Items]          
Exchange rate movements reducing long-term debt $ 206,000,000        
Designated as Hedging Instrument          
Derivative [Line Items]          
Notional value       2,001,000,000 2,399,000,000
Interest Rate Swap | Designated as Hedging Instrument          
Derivative [Line Items]          
Notional value       1,865,000,000 1,908,000,000
Interest Rate Swap | Designated as Hedging Instrument | Fair Value Hedging          
Derivative [Line Items]          
Notional value       1,865,000,000 1,908,000,000
Treasury Lock | Cash Flow Hedging          
Derivative [Line Items]          
Unrecognized aggregated losses related to terminated treasury rate lock contracts       2,000,000 $ 2,000,000
Unrecognized aggregated losses related to terminated treasury rate lock contracts, net of taxes 1,000,000 $ 1,000,000      
Line of Credit          
Derivative [Line Items]          
Intercompany Euro-denominated credit facility loan     € 1.2 1,400,000,000  
Line of Credit | Net Investment Hedging          
Derivative [Line Items]          
Exchange rate movements reducing long-term debt $ 29,000,000        
3.00% Notes due 2021          
Derivative [Line Items]          
Face amount       $ 500,000,000  
Interest rate     3.00% 3.00%  
2.20% Notes due 2022          
Derivative [Line Items]          
Face amount       $ 500,000,000  
Interest rate     2.20% 2.20%