Income Taxes Textuals (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
U.S. statutory federal income tax rate	21.00%	21.00%	35.00%
Unrecognized tax benefits	$ 80	$ 73	$ 24	$ 308
Unrecognized tax benefits that effect effective tax rate	57	52	19
Unrecognized tax benefits change as a result of potential resolutions of prior years' tax	4
Unrecognized tax benefits income tax penalties and interest expense	3		$ (1)
Unrecognized tax benefits income tax penalties and interest accrued	8	5
Current federal taxes payable/receivable	431	727
Deemed repatriation tax	441
Income tax paid/refund net	359	$ 144
Twelve Month [Member]
Income Tax Contingency [Line Items]
Unrecognized tax benefits that effect effective tax rate	$ 3
Internal Revenue Service (IRS) [Member] | Earliest Year [Member]
Income Tax Contingency [Line Items]
Open tax years by major tax jurisdiction	2016