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Accounting for Derivative Instruments and Hedging Activities (Details)
£ in Millions, $ in Millions
3 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2021
GBP (£)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Gain (Loss) On Financial Instruments, Net          
Change in fair value of cross-currency derivative instruments $ 63 $ (426)      
Foreign currency remeasurement of Sterling Notes to U.S. dollars (15) 108      
Gain (loss) on financial instruments, net $ 48 $ (318)      
Cross Currency Derivatives          
Derivatives:          
Notional amount | £     £ 1,275    
Collateral holiday agreement, percentage of position covered     60.00% 60.00%  
Collateral holiday agreement, term 3 years        
collateral cap term 10 years        
Collateral cap, percentage of position 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       $ 121 $ 184