Percentage of liability position derivative instruments covered by a collateral holiday agreement.

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Number of years liability position derivative instruments are covered by a collateral holiday agreement.

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Percentage of liability position derivative instruments covered by a collateral cap.

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Number of years liability position derivative instruments are covered by a collateral cap.

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

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Maximum amount of collateral required to be posted under collateral cap

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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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Nominal or face amount used to calculate payment on derivative.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement.

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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

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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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Accounting for Derivative Instruments and Hedging Activities (Details) £ in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 GBP (£)	Dec. 31, 2018 USD ($)
Derivatives:
collateral cap term			10 years
Collateral cap, percentage of position covered	40.00%		40.00%		40.00%
Maximum amount of collateral required to be posted	$ 150		$ 150
Gain (loss) on financial instruments, net:
Change in fair value of cross-currency derivative instruments	(86)	$ (10)	(172)	$ (63)
Foreign currency remeasurement of Sterling Notes to U.S. dollars	52	22	56	63
Gain (loss) on financial instruments, net	$ (34)	$ 12	$ (116)	$ 0
Cross Currency Derivatives
Derivatives:
Notional amount \| £					£ 1,275
Collateral holiday agreement, percentage of position covered	60.00%		60.00%		60.00%
Collateral holiday agreement, term			3 years
Level 2 \| Cross Currency Derivatives
Derivatives:
Derivative Liability	$ 409		$ 409			$ 237