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Income Taxes (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Mar. 27, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Effective tax rate (percent)		17.70%	19.20%	1.80%	20.00%
Benefits from accelerated amortization of certain investment tax credits		$ 10
Change in amount of valuation allowance				$ 52
Unrecognized tax benefits decrease		2
Worthless stock deduction				28
Unrecognized tax benefits, portion expected to be resolved in the next fiscal year		57		57
Unrecognized tax benefits that would impact effective tax rate		$ 55		$ 55
Amount of refundable AMT credits	$ 18

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- Definition

Effective Income Tax Rate Reconciliation, CARES Act, Refundable AMT Credits, Amount

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Unrecognized Tax Benefits, Portion Expected To Be Resolved in the Next Fiscal Year

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to investment tax credit.

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-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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-Paragraph 12
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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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-Name Accounting Standards Codification
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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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-Name Accounting Standards Codification
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