Goodwill and Other Intangible Assets (Details 2) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Identifiable intangibles
Gross Carrying Amount	$ 165	$ 162
Accumulated Amortization	(61)	(52)
Net	$ 104	110
Finite-lived intangible asset, useful life	20 years
Amortization expense	$ 8	8	$ 7
Customer relationships
Identifiable intangibles
Gross Carrying Amount	133	131
Accumulated Amortization	(52)	(45)
Net	81	86
Trade names
Identifiable intangibles
Gross Carrying Amount	32	31
Accumulated Amortization	(9)	(7)
Net	$ 23	$ 24

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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