Pension and Other Postretirement Benefits, Contributions (Details) $ in Millions	3 Months Ended
Mar. 29, 2019 USD ($)
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Contribution to defined benefit plans	$ 8
Expected contributions to plans during the remainder of fiscal year	72
Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Contribution to defined benefit plans	1
Expected contributions to plans during the remainder of fiscal year	$ 7

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Name:	us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration