Income Taxes (Unaudited) Effective Income Tax Rate Reconciliation (Details 1) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Federal and foreign income tax expense	$ 821	$ 185
Effective income tax rate	27.20%	17.60%
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	52	41
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount		$ 13
Income Taxes Receivable	$ 0		$ 792