Income Taxes (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Increase in Research Tax Credit	$ 69	$ (58)
Increase in Qualified Production Activity	39
Income taxes paid, net	517	691	$ 118
Income Tax Reconciliation (Table Amounts) [Abstract]
Income tax expense at statutory rate	$ 1,067	$ 1,023	$ 976
Income tax expense at statutory rate, Percent	35.00%	35.00%	35.00%
Stock compensation - excess tax benefits	$ (48)	$ (85)	$ 0
Stock compensation - excess tax benefits, Percent	(1.60%)	(2.90%)	(0.00%)
Research credit	$ (130)	$ (61)	$ (119)
Research credit, Percent	(4.20%)	(2.10%)	(4.30%)
Manufacturing deduction	$ (97)	$ (58)	$ (31)
Manufacturing deduction, Percent	(3.20%)	(2.00%)	(1.10%)
Settlements with taxing authorities	$ (42)	$ (40)	$ 0
Settlements with taxing authorities, Percent	(1.40%)	(1.40%)	0.00%
Repatriation of non-U.S. earnings	$ 0	$ (33)	$ 0
Repatriation of non-U.S. earnings, Percent	0.00%	(1.10%)	0.00%
Impacts related to the 2017 Tax Act	$ 300	$ 0	$ 0
Impacts related to the 2017 Tax Act, Percent	9.80%	0.00%	0.00%
Other, net	$ (16)	$ (23)	$ (26)
Other net, Percent	(0.50%)	(0.80%)	(0.90%)
Total federal and foreign income tax expense	$ 1,034	$ 723	$ 800
Effective income tax rate	33.90%	24.70%	28.70%