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Accounting for Derivative Instruments and Hedging Activities (Details)
£ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2021
GBP (£)
Dec. 31, 2021
USD ($)
Gain (loss) on financial instruments, net:          
Change in fair value of cross-currency derivative instruments $ (106) $ 40 $ 13    
Foreign currency remeasurement of Sterling Notes to U.S. dollars 20 (55) (67)    
Loss on financial instruments, net $ (86) (15) $ (54)    
Cross Currency Derivatives          
Derivatives:          
Notional amount | £       £ 1,275  
Collateral holiday agreement, position covered (percentage)       60.00% 60.00%
Collateral holiday agreement, term 3 years        
collateral cap term 10 years        
Collateral cap, percentage of liability covered       40.00% 40.00%
Maximum amount of collateral required to be posted         $ 150
Collateral Holiday Agreement Percentage Extended to November 2022       20.00% 20.00%
Level 2 | Cross Currency Derivatives          
Derivatives:          
Derivative Liability   $ 184     $ 290