Income Taxes (Unaudited) (Details 1) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Federal and foreign income tax expense	$ 122	$ 120	$ 460	$ 466
Effective income tax rate	11.60%	8.80%	14.80%	14.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount	$ 89	$ 106	$ 171	$ 156
Effective Income Tax Rate Reconciliation, Tax Deduction, FDII, Amount	17		26
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	$ 84		$ 84