Income Taxes Effective Income Tax Rate Reconciliation (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Reconciliation (Table Amounts) [Abstract]
Income tax expense at statutory rate	$ 783	$ 535	$ 786
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	21.00%
Stock compensation - excess tax benefits	$ (10)	$ (14)	$ (27)
Stock compensation - excess tax benefits, Percent	(0.20%)	(0.50%)	(0.70%)
Research credit	$ (206)	$ (216)	$ (186)
Research credit, Percent	(5.50%)	(8.50%)	(5.00%)
Foreign derived intangible income	$ (55)	$ (28)	$ (16)
Foreign derived intangible income, Percent	(1.50%)	(1.10%)	(0.40%)
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Amount	$ 0	$ 0	$ (84)
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Percent	0	0	(0.022)
Other, net	$ 27	$ 23	$ 40
Other net, Percent	0.70%	0.90%	1.00%
Total federal and foreign income tax expense	$ 539	$ 300	$ 513
Effective income tax rate	14.50%	11.80%	13.70%