Income Taxes, Summary of Loss and Tax Credit Carryforwards (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Tax Credit Carryforward [Line Items]
Capital loss carryforwards, Tax Effected	$ 13	$ 12
Capital loss carryforwards, Valuation Allowance, Tax Effected	(14)	(10)
Total loss carryforwards, Tax Effected	13
Tax credit carryforwards, Tax Effected	4	$ 5
Total loss carryforwards, Valuation Allowance Tax Effected	(7)
Tax credit carryforwards, Valuation Allowances Tax Effected	(3)
Federal [Member]
Tax Credit Carryforward [Line Items]
Capital loss carryforwards, Gross	23
Capital loss carryforwards, Tax Effected	5
Capital loss carryforwards, Valuation Allowance, Gross	(5)
Capital loss carryforwards, Valuation Allowance, Tax Effected	$ (1)
Federal [Member] | Minimum [Member]
Tax Credit Carryforward [Line Items]
Capital loss carryforwards, Expiration Period	2026
Federal [Member] | Maximum [Member]
Tax Credit Carryforward [Line Items]
Capital loss carryforwards, Expiration Period	2036
Foreign [Member]
Tax Credit Carryforward [Line Items]
Capital loss carryforwards, Gross	$ 18
Capital loss carryforwards, Tax Effected	4
Capital loss carryforwards, Valuation Allowance, Gross	(10)
Capital loss carryforwards, Valuation Allowance, Tax Effected	(3)
State [Member]
Tax Credit Carryforward [Line Items]
Capital loss carryforwards, Gross	291
Capital loss carryforwards, Tax Effected	4
Capital loss carryforwards, Valuation Allowance, Gross	(131)
Capital loss carryforwards, Valuation Allowance, Tax Effected	(3)
Tax credit carryforwards, Tax Effected	4
Tax credit carryforwards, Gross	5
Tax credit carryforwards, Valuation Allowances Gross	(4)
Tax credit carryforwards, Valuation Allowances Tax Effected	$ (3)
State [Member] | Minimum [Member]
Tax Credit Carryforward [Line Items]
Capital loss carryforwards, Expiration Period	2019
Tax credit carryforwards, Expiration Periods	2019
State [Member] | Maximum [Member]
Tax Credit Carryforward [Line Items]
Capital loss carryforwards, Expiration Period	2038
Tax credit carryforwards, Expiration Periods	2033