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Income Taxes Level 4 Net Operating Loss Carryover (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	$ 1,728	$ 1,894
Deferred Tax Assets, Capital Loss Carryforwards	15	0
Tax Credit Carryforward, Amount	$ 742	640
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2020
Tax Credit Carryforward, Expiration Date	Dec. 31, 2022
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	$ 33	56
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax	$ 742	640
Earliest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2023
Latest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2036
No expiration tax year [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount	$ 742
Capital Loss Carryforward [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount	44	0
Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	4,938	5,412
Domestic Tax Authority [Member] | Expiring Tax Year 2020 [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	1
Domestic Tax Authority [Member] | Expiring within Tax Years 2023 to 2036 [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	4,937
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount	33	$ 56
Foreign Tax Authority [Member] | No expiration tax year [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 3

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