Income Taxes (Unaudited) Effective Income Tax Rate Reconciliation (Details 1) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Federal and foreign income tax expense	$ 265	$ 198	$ 1,086	$ 383
Effective income tax rate	20.40%	16.50%	25.20%	17.00%
Effective Income Tax Rate Reconciliation, Disposition of Business, Amount			$ 250
Nondeductible Goodwill, Divested Business			1,200
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount	$ 48	$ 48	99	$ 90
Income Taxes Receivable	$ 0		$ 0		$ 792