Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Name:	us-gaap_RestructuringCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Separation and Other Termination Costs (Details) $ in Millions		2 Months Ended	12 Months Ended
	Feb. 03, 2021 USD ($) employee	Mar. 01, 2021 USD ($) employee	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Separation and other termination costs			$ 44	$ 12	$ 38
Subsequent event
Restructuring Cost and Reserve [Line Items]
Separation and other termination costs	$ 20	$ 20
Number of employees terminated \| employee	220	220
Number of employees terminated, percent	15.00%	15.00%
One-time termination benefits
Restructuring Cost and Reserve [Line Items]
Separation and other termination costs			$ 44	$ 12	$ 38