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Derivatives and Hedging - Cash flow hedges (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Apr. 05, 2018
Derivatives and Hedging      
Average interest rate     2.56%
Interest rate swaps | Maximum      
Derivatives and Hedging      
Contract term 2 years 3 months 18 days    
Derivatives designated as hedging instruments | Interest rate swaps      
Derivatives and Hedging      
Notional amount $ 1,000 $ 1,000  
Derivatives designated as hedging instruments | Interest rate swaps | Maximum      
Derivatives and Hedging      
Contract term   3 years 3 months 18 days  
Derivatives designated as hedging instruments | Purchase contracts settled in US dollars | EURO      
Derivatives and Hedging      
Notional amount   $ 9  
Derivatives designated as hedging instruments | Purchase contracts settled in US dollars | EURO | Maximum      
Derivatives and Hedging      
Contract term   3 months 18 days  
Derivatives designated as hedging instruments | Purchase contracts settled in US dollars | Japanese Yen      
Derivatives and Hedging      
Notional amount   $ 177  
Derivatives designated as hedging instruments | Purchase contracts settled in US dollars | Japanese Yen | Maximum      
Derivatives and Hedging      
Contract term   2 months 12 days  
Derivatives designated as hedging instruments | Sales contracts settled in United States dollars | EURO      
Derivatives and Hedging      
Notional amount   $ 20  
Derivatives designated as hedging instruments | Sales contracts settled in United States dollars | EURO | Maximum      
Derivatives and Hedging      
Contract term   6 months  
Derivatives designated as hedging instruments | Sales contracts settled in United States dollars | Japanese Yen      
Derivatives and Hedging      
Notional amount   $ 177  
Derivatives designated as hedging instruments | Sales contracts settled in United States dollars | Japanese Yen | Maximum      
Derivatives and Hedging      
Contract term   2 months 12 days  
Derivatives not designated as hedging instruments | Sales contracts settled in United States dollars | EURO      
Derivatives and Hedging      
Notional amount $ 10    
Derivatives not designated as hedging instruments | Sales contracts settled in United States dollars | EURO | Maximum      
Derivatives and Hedging      
Contract term 1 month 6 days