Income Taxes Textuals (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Contingency [Line Items]
U.S. statutory federal income tax rate	21.00%	21.00%	21.00%
Unrecognized tax benefits	$ 98	$ 60	$ 53	$ 24
Unrecognized tax benefits that effect effective tax rate	15	38	32
Unrecognized tax benefits decrease as a result of potential resolutions of prior years' tax	3
Unrecognized tax benefits income tax penalties and interest expense	130	3	$ 20
Unrecognized tax benefits income tax penalties and interest accrued	170	29
Current federal taxes payable/receivable	380	431
Deemed repatriation tax	441
Income tax paid/refund net	112	$ 359
Twelve Month [Member]
Income Tax Contingency [Line Items]
Unrecognized tax benefits that effect effective tax rate	$ 2
Internal Revenue Service (IRS) [Member] | Earliest Year [Member]
Income Tax Contingency [Line Items]
Open tax years by major tax jurisdiction	2017
Internal Revenue Service (IRS) [Member] | Latest Year [Member]
Income Tax Contingency [Line Items]
Open tax years by major tax jurisdiction	2018