Other Income (Expense), Net (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended	12 Months Ended
Apr. 30, 2020	Jul. 02, 2021	Apr. 02, 2021	Oct. 02, 2020	Jul. 03, 2020	Jul. 02, 2021	Jul. 03, 2020	Dec. 31, 2020	Dec. 31, 2019
Other Income and Expenses [Abstract]
Other components of net periodic benefit costs		$ 11			$ 5	$ 22	$ 10
Investment gains (losses)		86			(6)	202	(13)
Realized investment gains (losses)		11				38
Unrealized gain (loss) on investments		75			(6)	164	(13)
Proceeds from sale of product lines	$ 826		$ 26	$ 16	810	26	810
Pretax gain on sale of product lines	455	$ 0	13		455	$ 13	455
Gain on sale of product lines, net of tax	$ 305		$ 10		$ 305		$ 305
Disposal group, product lines, revenues								$ 88	$ 170

Disposal Group, Not Discontinued Operation, Certain Product Lines, Revenues

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Gain on Sale of Product Lines, Net of Tax

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Amount of net pension and postretirement benefits classified as other income.

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Proceeds From Sale Of Product Lines, Net Of Cash Transferred And Transaction Costs

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Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

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Amount of realized and unrealized gain (loss) on investment.

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Amount of realized gain (loss) on investment.

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Amount of unrealized gain (loss) on investment.

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