Goodwill and Intangible Assets Intangible Narrative (Details) - USD ($) $ in Millions	1 Months Ended	11 Months Ended	12 Months Ended
Dec. 31, 2019	Dec. 13, 2019	Dec. 31, 2020	Dec. 31, 2018
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Intangible Assets, Net of Accumulated Amortization of $173 at December 31, 2020 and $9 at December 31, 2019	$ 1,114		$ 810
Impairment of Intangible Assets (Excluding Goodwill)			155
Amortization of Intangible Assets	9	$ 61	163	$ 63
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 9	$ 61	$ 163	$ 63

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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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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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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