Income Taxes (Unaudited) (Details 1) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Federal and foreign income tax expense	$ 167	$ 187	$ 338	$ 346
Effective income tax rate	16.20%	19.20%	16.40%	17.50%
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount	$ 36	$ 22	$ 67	$ 42
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount	$ 15		15
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount			$ 13	$ 26