Income Taxes (Unaudited) Effective Income Tax Rate Reconciliation (Details 1) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Federal and foreign income tax expense	$ 212	$ 181	$ 1,298	$ 564
Effective income tax rate	16.60%	15.50%	23.20%	16.50%
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	$ 43	$ 45	142	$ 135
IncomeTaxReconciliationDeductionsFDII	12	$ 30	32	$ 46
Income Taxes Receivable	$ 123		$ 123		$ 792