Derivative and Hedging Activities - Cash Flow Hedges Components of AOCI (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	8 Months Ended	9 Months Ended
Feb. 09, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI, after tax, beginning of period	$ 45			$ 0
Losses reclassified to income, after tax	3	$ 0	$ 7	0	$ 24
AOCI, after tax, end of period	0
Cash flow hedging
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI, before tax, beginning of period	(12)	0	(28)	0	(45)
AOCI, after tax, beginning of period	45	0	29	0	12
Losses reclassified to income, before tax	3	0	7	0	24
Losses reclassified to income, after tax	3	0	7	0	24
Fresh start adjustments, before tax	9			0	0
Fresh start adjustments, after tax	9			0	0
Elimination of tax effects, before tax	0			0	0
Elimination of tax effects, after tax	(57)			0	0
AOCI, before tax, end of period	0	0	(21)	0	(21)
AOCI, after tax, end of period	$ 0	$ 0	$ 36	$ 0	$ 36

Other Comprehensive Income (Loss), Elimination of Tax Effects, before Tax

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Other Comprehensive Income (Loss), Elimination of Tax Effects, Net of Tax

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Other Comprehensive Income (Loss), Fresh Start Adjustments, before Tax

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Other Comprehensive Income (Loss), Fresh Start Adjustments, Net of Tax

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, including portion attributable to noncontrolling interest. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners).

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount, after tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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