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Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Dec. 31, 2020	Jun. 30, 2020	Jun. 30, 2019
Income Tax [Line Items]
Income tax expense (benefit)	$ (3)		$ 68		$ (420)	$ (51)
Valuation allowance against deferred tax assets, percent					100.00%
Increase in unrecognized tax benefits		$ 34
CARES Act [Member]
Income Tax [Line Items]
Income tax expense (benefit)					$ (96)
Scenario Forecast [Member] | CARES Act [Member]
Income Tax [Line Items]
Income tax expense (benefit)				$ (2)

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- Definition

Income Tax [Line Items]

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Percentage of deferred tax asset that was recorded as a valuation allowance.

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

+ References

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Amount of increase (decrease) in unrecognized tax benefits attributable to uncertain tax positions taken in tax returns.

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