Income Taxes - Reconciliation of Income Tax Expense Computed Using U.S. Statutory Federal Tax Rate to Actual Income Tax Expense (Details) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
	Mar. 04, 2019	Sep. 29, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Amount
Income tax expense at the U.S. federal statutory tax rate				$ 1,729	$ 1,521	$ 1,226
Foreign derived intangible income deduction				(170)	(122)	(61)
Research and development tax credit				(97)	(148)	(138)
Tax deductible dividends				(64)	(62)	(59)
Excess tax benefits for share-based payment awards				(52)	(63)	(55)
Tax accounting method change				0	(15)	(61)
Deferred tax write-down and transition tax				0	0	(43)
Other, net				1	(100)	(17)
Total income tax expense				$ 1,347	$ 1,011	$ 792
Rate
Income tax expense at the U.S. federal statutory tax rate				21.00%	21.00%	21.00%
Foreign derived intangible income deduction				(2.10%)	(1.70%)	(1.00%)
Research and development tax credit				(1.20%)	(2.00%)	(2.40%)
Tax deductible dividends				(0.80%)	(0.90%)	(1.00%)
Excess tax benefits for share-based payment awards				(0.60%)	(0.90%)	(0.90%)
Tax accounting method change				0.00%	(0.20%)	(1.00%)
Deferred tax write-down and transition tax				0	0	(0.007)
Other, net				0.10%	(1.30%)	(0.40%)
Income tax expense				16.40%	14.00%	13.60%
Foreign derived intangible income deduction related to prior year	$ 75	$ 62	$ 65	$ 21	$ 98