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Income Taxes Level 4 Deferred tax assets (liabilities) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Deferred Tax Assets, Net of Valuation Allowance [Abstract]
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Loss Reserves	$ 508	$ 524
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	144	162
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Unearned Premiums Reserve	390	377
Deferred Tax Assets, Investments	593	831
Deferred Tax Assets, Derivative Instruments	79	90
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits	517	655
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax	640	639
Deferred Tax Assets, Tax Credit Carryforwards, General Business	99	0
Deferred Tax Assets, Operating Loss Carryforwards	1,894	1,831
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	56	154
Deferred Tax Assets, Capital Loss Carryforwards	0	78
Deferred Tax Assets, Gross	5,037	5,341
Deferred Tax Assets, Valuation Allowance	0	(79)
Deferred Tax Assets, Net of Valuation Allowance	5,037	5,262
Components of Deferred Tax Assets and Liabilities [Abstract]
Deferred Tax Liabilities, Deferred Expense, Deferred Policy Acquisition Cost	(676)	(943)
Tax Basis of Investments, Unrealized Appreciation (Depreciation), Net	(837)	(842)
Deferred Tax Liabilities, Deferred Expense	243	229
Deferred Tax Liabilities, Other	0	(42)
Deferred Tax Liabilities, Gross	1,756	2,056
Deferred Tax Assets, Net	$ 3,281	3,206
Valuation Allowance, Commentary	A deferred tax valuation allowance has not been recorded because the Company believes the deferred tax assets will more likely than not be realized. In assessing the need for a valuation allowance, management considered future taxable temporary difference reversals, future taxable income exclusive of reversing temporary differences and carryovers, taxable income in open carry back years and other tax planning strategies. From time to time, tax planning strategies could include holding a portion of debt securities with market value losses until recovery, altering the level of tax exempt securities held, making investments which have specific tax characteristics, and business considerations such as asset-liability matching. Management views such tax planning strategies as prudent and feasible and would implement them, if necessary, to realize the deferred tax assets.
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards, Domestic		1,814
Deferred Tax Assets, Tax Credit Carryforwards	$ 56	154
Tax Credit Carryforward, Amount	0	222
Deferred Tax Assets, Other	117	0
Deferred Tax Assets, Operating Loss Carryforwards, Foreign		17
Domestic Tax Authority [Member]
Deferred Tax Assets, Net of Valuation Allowance [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards	1,894
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	5,412
Operating Loss Carryforwards		5,182
Foreign Tax Authority [Member]
Deferred Tax Assets, Net of Valuation Allowance [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards	9
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	48
Operating Loss Carryforwards		$ 89
Expiring Tax Year 2020 [Member]
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	$ 1
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2020
Latest Tax Year [Member]
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2036
Tax Credit Carryforward, Expiration Date	Dec. 31, 2036
Expiring within Tax Years 2023 to 2033 [Member]
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	$ 5,411
No expiration tax year [Member]
Deferred Tax Assets, Net of Valuation Allowance [Abstract]
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax	640
Deferred Tax Assets, Operating Loss Carryforwards	48
Expiring within Tax Years 2020 to 2024 [Member] [Member] [Domain]
Deferred Tax Assets, Net of Valuation Allowance [Abstract]
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	56
Expiring Tax Year 2019 [Member]
Deferred Tax Assets, Net of Valuation Allowance [Abstract]
Deferred Tax Assets, Capital Loss Carryforwards	$ 0
Earliest Tax Year [Member]
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2020
Energy Solar [Member]
Deferred Tax Assets, Net of Valuation Allowance [Abstract]
Deferred Tax Assets, Tax Credit Carryforwards, General Business	$ 96

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