Income Taxes (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Effective income tax rate	24.70%	28.70%	29.60%
Effective Income Tax Rate Reconciliation, Increase in Research Tax Credit	$ (58)	$ 76
Income taxes paid, net	691	118	$ 727
Income Tax Reconciliation (Table Amounts) [Abstract]
Income tax expense at statutory rate	1,023	976	1,028
Stock compensation - excess tax benefits	(85)	0	0
Research credit	(61)	(119)	(43)
Manufacturing deduction	(58)	(31)	(48)
Settlements with taxing authorities	(40)	0	(51)
Repatriation of non-U.S. earnings	(33)	0	0
Other, net	(23)	(26)	(18)
Total federal and foreign income tax expense	$ 723	$ 800	$ 868