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Goodwill and Other Intangible Assets (Details 2) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Identifiable intangibles
Gross Carrying Amount	$ 134		$ 134		$ 165
Accumulated Amortization	(68)		(68)		(61)
Net	66		$ 66		104
Finite-Lived Intangible Asset, Useful Life			20 years
Amortization expense	2	$ 2	$ 6	$ 6
Long-lived and intangible asset impairment	236	$ 0	236	$ 0
Total estimated amortization expense for the five succeeding fiscal years
Remainder of 2021	1		1
2022	7		7
2023	15		15
2024	9		9
2025	4		4
2026	4		4
U.K.
Identifiable intangibles
Long-lived and intangible asset impairment			50
Long-lived assets	450		450
Customer relationships
Identifiable intangibles
Gross Carrying Amount	84		84		133
Accumulated Amortization	(58)		(58)		(52)
Net	26		26		81
Long-lived and intangible asset impairment			49
Trade names
Identifiable intangibles
Gross Carrying Amount	31		31		32
Accumulated Amortization	(10)		(10)		(9)
Net	21		21		23
Long-lived and intangible asset impairment			1
Customer Relationships and Trade Names | U.K.
Identifiable intangibles
Long-lived assets	30		30
U.K. carbon credits
Identifiable intangibles
Gross Carrying Amount	19		19		0
Accumulated Amortization	0		0		0
Net	$ 19		$ 19		$ 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 of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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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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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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