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Financial Instruments - Narratives (Details)
€ in Millions, £ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2021
GBP (£)
Dec. 31, 2021
EUR (€)
Dec. 31, 2020
GBP (£)
Dec. 31, 2020
EUR (€)
Net Investment Hedging | Senior Euro Notes Maturing 2022 to 2039 and ECP Notes | Senior Notes              
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]              
Notional amount | €         € 8,275   € 7,466
Net Investment Hedging | Senior EURO Floating Rate Notes And Senior Euro Notes Maturing 2021 | Senior Notes              
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]              
Notional amount | €             1,000
Interest rate swap | Fair Value Hedging              
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]              
Notional amount $ 1,854,000,000 $ 1,000,000,000   £ 925 500   500
Derivative liability fair value (85,000,000)            
Derivative asset fair value   10,000,000          
Interest rate swap | Net Investment Hedging              
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]              
Derivative liability fair value   (306,000,000)          
Derivative asset fair value 258,000,000            
Currency forward contract | Net Investment Hedging              
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]              
Notional amount | £       1,193   £ 1,850  
Loss on net investment hedge $ 878,000,000 $ (951,000,000) $ (229,000,000)        
Cross currency swap | Net Investment Hedging              
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]              
Notional amount       £ 2,345 € 5,906 £ 565 € 4,508