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Accounting for Derivative Instruments and Hedging Activities (Details) £ in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 GBP (£)	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Gain (Loss) On Financial Instruments, Net
Change in fair value of cross-currency derivative instruments	$ (85)	$ 61	$ (22)	$ (365)
Foreign currency remeasurement of Sterling Notes to U.S. dollars	(6)	3	(21)	111
Gain (loss) on financial instruments, net	$ (91)	$ 64	$ (43)	$ (254)
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						$ 206	$ 184

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Gain (Loss) On Financial Instruments, Net [Abstract]

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

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