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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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

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Goodwill and Other Intangible Assets (Details 2) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Identifiable intangibles
Gross Carrying Amount(1)		$ 115	$ 165
Accumulated Amortization		(70)	(61)
Net		$ 45	104
Finite-lived intangible asset, useful life		20 years
Amortization expense		$ 8
Long-lived and intangible asset impairment	$ 236	236	0	$ 0
Realized net gains (losses)		29	0	$ 0
United Kingdom
Identifiable intangibles
Long-lived and intangible asset impairment		50
Long-Lived Assets		425
United Kingdom \| Natural gas derivatives
Identifiable intangibles
Proceeds from sale of energy credits	46
Realized net gains (losses)	$ 27
Customer relationships
Identifiable intangibles
Gross Carrying Amount(1)		84	133
Accumulated Amortization		(60)	(52)
Net		24	81
Long-lived and intangible asset impairment		49
Trade names
Identifiable intangibles
Gross Carrying Amount(1)		31	32
Accumulated Amortization		(10)	(9)
Net		21	$ 23
Long-lived and intangible asset impairment		1
Customer Relationships and Trade Names \| United Kingdom
Identifiable intangibles
Long-Lived Assets		$ 30