Income Taxes - Reconciliation of Income Tax Expense Computed Using U.S. Statutory Federal Tax Rate to Actual Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Amount
Income tax expense at the U.S. federal statutory tax rate	$ 1,585	$ 1,729	$ 1,521
Foreign derived intangible income deduction	(170)	(170)	(122)
Research and development tax credit	(118)	(97)	(148)
Tax deductible dividends	(65)	(64)	(62)
Excess tax benefits for stock-based payment awards	(28)	(52)	(63)
Other, net	31	1	(115)
Total federal and foreign income tax expense	$ 1,235	$ 1,347	$ 1,011
Rate
Income tax expense at the U.S. federal statutory tax rate	21.00%	21.00%	21.00%
Foreign derived intangible income deduction	(2.30%)	(2.10%)	(1.70%)
Research and development tax credit	(1.60%)	(1.20%)	(2.00%)
Tax deductible dividends	(0.90%)	(0.80%)	(0.90%)
Excess tax benefits for stock-based payment awards	(0.40%)	(0.60%)	(0.90%)
Other, net	0.60%	0.10%	(1.50%)
Income tax expense	16.40%	16.40%	14.00%
Foreign derived intangible income deduction related to prior year			$ 98