Other Income (Expense), Net (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
Apr. 30, 2020	Apr. 02, 2021	Apr. 03, 2020	Dec. 31, 2020	Dec. 31, 2019
Other Income and Expenses [Abstract]
Other components of net periodic benefit costs		$ 11	$ 5
Investment gains/(losses)		116	(7)
Realized investment gains (losses)		27
Unrealized gain (loss) on investments		89	(7)
Proceeds from sale of product lines	$ 826	26	0
Pretax gain on sale of product lines	455	13	$ 0
Gain on sale of product lines, net of tax	$ 305	$ 10
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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