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Income Taxes 2017 Tax Reform (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 01, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Federal income tax		21.00%	35.00%	35.00%
New Federal Income Tax Rate	21.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount		$ 0	$ 1,240	$ 0
Impact of the 2017 Tax Reform on Expense		26	16	$ 19
Impact of 2017 Tax Reform [Member]
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount			1,240
Impact of the 2017 Tax Reform on Expense		2
Impact of 2017 Tax Reform [Member] | after tax [Member]
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount		27	144
Impact of 2017 Tax Reform [Member] | pre-tax [Member]
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount		$ 36	$ 219

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