Accumulated Other Comprehensive Income Level 4 (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 8,230	$ 8,335	$ 8,230	$ 8,335		$ 8,162		$ 9,291
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	146	(85)	644	(429)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(23)	11	(46)	(17)
Other Comprehensive Income (Loss), Net of Tax	123	(74)	598	(446)
Gain (Loss) on Investments, Excluding Other than Temporary Impairments	(19)	2	(122)	14
Income Tax Expense (Benefit)	13	12	24	63
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,130	703	1,130	703	$ 993	539	$ 790	1,154
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	155	(103)	623	(445)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(18)	16	(32)	(6)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	137	(87)	591	(451)
Gain (Loss) on Investments, Excluding Other than Temporary Impairments		(24)	49	10
Income before income taxes				10
Income Tax Expense (Benefit)	10	(8)	17	4
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	63	75	63	75	77	57	62	70
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(9)	18	20	16
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(5)	(5)	(14)	(11)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(14)	13	6	5
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(2)	(3)	(2)	(3)	(2)	(3)	(3)	(3)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	0	1	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0	0	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	0	0	1	0
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,191	775	1,191	775	$ 1,068	$ 593	$ 849	$ 1,221
Other Comprehensive Income (Loss), Net of Tax				(446)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	23	(11)	46	17
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	18	(16)	32	6
Gain (Loss) on Investments, Excluding Other than Temporary Impairments	28	(24)	49	10
Income before income taxes	28	(24)	49
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income Tax Expense (Benefit)	2	3	8	6
Cash Flow Hedging [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	5	5	14	11
Income before income taxes	7	$ 8	22	$ 17
Interest Rate Swap [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Cash Flow Hedging [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	0
Interest Rate Swap [Member] | Interest Income [Member] | Cash Flow Hedging [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	6		19
Interest Rate Swap [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Cash Flow Hedging [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net			0
Currency Swap [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Cash Flow Hedging [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 1		$ 3