Income Taxes (Unaudited) Effective Income Tax Rate Reconciliation (Details 1) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Federal and foreign income tax expense	$ 198	$ 167	$ 383	$ 338
Effective income tax rate	16.50%	16.20%	17.00%	16.40%
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount	$ 48	$ 51	$ 90	$ 82
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount			$ 13	$ 13