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Income Taxes (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Jul. 28, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Tax [Line Items]
Income tax expense (benefit)		$ (90)	$ 54	$ (510)	$ 3
Decrease in unrecognized tax benefits		34
Tax adjustments, settlements, and unusual provisions		$ 34
Valuation allowance against deferred tax assets, percent				100.00%
Other income tax expense					$ 18
CARES Act [Member]
Income Tax [Line Items]
Income tax expense (benefit)	$ (105)			$ (105)

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Income Tax [Line Items]

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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