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Derivatives - Fair Value Hedges (Details)
€ in Millions
1 Months Ended
Aug. 31, 2015
USD ($)
interestRateSwap
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2014
USD ($)
Nov. 30, 2013
EUR (€)
Fixed rate medium term note due 2019              
Derivatives in Fair Value Hedging Relationships              
Principal amount           $ 625,000,000  
Interest rate contracts              
Derivatives in Fair Value Hedging Relationships              
Derivative notional amount   $ 800,000,000          
Fair value hedges | Eurobond Due 2021              
Derivatives in Fair Value Hedging Relationships              
Principal amount | €             € 600
Fair value hedges | June 2014 medium term notes issued              
Derivatives in Fair Value Hedging Relationships              
Principal amount           950,000,000  
Fair value hedges | Fixed rate medium term note due 2019              
Derivatives in Fair Value Hedging Relationships              
Principal amount           625,000,000  
Fair value hedges | August 2015 medium term notes issued              
Derivatives in Fair Value Hedging Relationships              
Principal amount $ 1,500,000,000            
Fair value hedges | Fixed rate medium term note due 2021              
Derivatives in Fair Value Hedging Relationships              
Principal amount     $ 400,000,000 $ 400,000,000      
Fair value hedges | Interest rate contracts              
Derivatives in Fair Value Hedging Relationships              
Number of interest rate swap contracts entered in period | interestRateSwap 2            
Fair value hedges | Interest rate contracts | Eurobond Due 2021              
Derivatives in Fair Value Hedging Relationships              
Derivative notional amount | €             € 300
Fair value hedges | Interest rate contracts | Fixed rate medium term note due 2019              
Derivatives in Fair Value Hedging Relationships              
Derivative notional amount           $ 600,000,000  
Fair value hedges | Interest rate contracts | Fixed rate medium term note due 2018              
Derivatives in Fair Value Hedging Relationships              
Derivative notional amount $ 450,000,000            
Term of debt instrument (in years) 3 years            
Fair value hedges | Interest rate contracts | Fixed rate medium term note due 2020              
Derivatives in Fair Value Hedging Relationships              
Derivative notional amount $ 300,000,000       $ 200,000,000    
Term of debt instrument (in years) 5 years            
Fair value hedges | Interest rate contracts | Fixed rate medium term note due 2021              
Derivatives in Fair Value Hedging Relationships              
Derivative notional amount       $ 200,000,000