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Goodwill and Other Intangible Assets (Details 2) - USD ($) $ in Millions	3 Months Ended					12 Months Ended			24 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2022
Identifiable intangibles
Gross Carrying Amount	$ 50					$ 50	$ 115		$ 50
Accumulated Amortization	(35)					(35)	(70)		(35)
Net	15					$ 15	45		15
Finite-lived intangible asset, useful life						18 years
Amortization expense						$ 3
U.K. long-lived and intangible asset impairment		$ 87			$ 236	239	236	$ 0
Realized net gains (losses)						6	29	$ 0
Impairment of Intangible Assets, Indefinite-Lived (Excluding Goodwill)		15
Trade Names [Member]
Identifiable intangibles
Impairment of Intangible Assets, Indefinite-Lived (Excluding Goodwill)		9	$ 8			17	1		18
United Kingdom
Identifiable intangibles
Proceeds from sale of energy credits							46
Realized net gains (losses)							27
Customer Relationships [Member]
Identifiable intangibles
Gross Carrying Amount	50					50	84		50
Accumulated Amortization	(35)					(35)	(60)		(35)
Net	15					15	24		15
U.K. long-lived and intangible asset impairment	6	$ 6		$ 49		55
Trade Names [Member]
Identifiable intangibles
Gross Carrying Amount	0					0	31		0
Accumulated Amortization	0					0	(10)		0
Net	$ 0					$ 0	$ 21		$ 0

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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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 after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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The cash inflow for a financial contract that meets the hedge criteria as either a cash flow hedge, fair value hedge, or hedge of a net investment in a foreign operation.

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