Goodwill and Other Intangible Assets - Definite-lived Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Definite-lived Intangible assets
Gross Carrying Amount	$ 782	$ 761
Accumulated Amortization	(590)	(568)
Net Carrying Amount	192	193
Aggregate amortization expense for definite-lived intangible assets	45	34	$ 31
Estimated future intangible amortization expense
2023	42
2024	31
2025	26
2026	21
2027	13
Customer relationships
Definite-lived Intangible assets
Gross Carrying Amount	265	254
Accumulated Amortization	(174)	(163)
Net Carrying Amount	91	91
Contracts
Definite-lived Intangible assets
Gross Carrying Amount	222	235
Accumulated Amortization	(210)	(217)
Net Carrying Amount	12	18
Other
Definite-lived Intangible assets
Gross Carrying Amount	295	272
Accumulated Amortization	(206)	(188)
Net Carrying Amount	$ 89	$ 84

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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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 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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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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