Investment Holding Level 4 Available-for-Sale Securities (Details) $ in Millions	Sep. 30, 2016 USD ($) securities	Dec. 31, 2015 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Number of Securities Included in AFS Securities in Unrealized Loss Position \| securities	1,237
Available-for-sale Debt Securities, Amortized Cost Basis	$ 23,219	$ 23,559
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	2,498	1,431
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	93	331
Available-for-sale Securities, Debt Securities	25,625	24,657
Available-for-sale Equity Securities, Amortized Cost Basis	89	471
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	15	11
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	5	11
Available-for-sale Securities, Equity Securities	99	459
Available-for-sale Securities, Amortized Cost Basis	23,308	23,737
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	2,513	1,442
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	98	342
Available-for-sale Securities		24,835
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	694	953
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	4,522	4,973
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	3,715	3,650
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	8,158	8,361
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	6,130	5,622
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	701	974
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	6,309	5,721
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	9,951	9,173
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	3,958	3,714
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	4,706	5,075
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost	1,844	8,179
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,818	7,937
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	27	242
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	1,603	1,545
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,532	1,443
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	71	100
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	3,447	9,724
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	3,350	9,380
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	98	342
Municipal Bonds [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost	10	179
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	10	174
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	5
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	10	179
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	10	174
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0	5
Fixed maturities available-for-sale, excluding mortgage-backed and asset-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	17,089	17,937
Available-for-sale Securities, Debt Securities	19,316	18,936
Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	1,061	864
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	17	16
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	29	34
Available-for-sale Securities, Debt Securities	1,049	846
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost	112	387
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	111	385
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1	2
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	273	271
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	245	239
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	28	32
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	385	658
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	356	624
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	29	34
Collateralized Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	1,156	1,354
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	57	67
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	5	11
Available-for-sale Securities, Debt Securities	1,209	1,408
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost	281	608
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	281	602
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1	6
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	540	500
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	536	493
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	4	5
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	821	1,108
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	817	1,095
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	5	11
Commercial Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	2,182	1,936
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	95	52
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	8	24
Available-for-sale Securities, Debt Securities	2,269	1,964
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	2	3
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost	294	655
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	291	636
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	3	19
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	114	99
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	109	94
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	5	5
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	408	754
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	400	730
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	8	24
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	13,939	14,425
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	1,696	975
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	42	225
Available-for-sale Securities, Debt Securities	15,593	15,175
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	0	3
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost	802	4,880
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	784	4,696
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	18	184
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	393	363
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	369	322
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	24	41
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	1,195	5,243
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,153	5,018
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	42	225
Foreign Government Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	306	328
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	34	14
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	2	11
Available-for-sale Securities, Debt Securities	338	331
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost	43	144
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	42	136
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1	8
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	6	30
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	5	27
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1	3
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	49	174
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	47	163
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	2	11
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	1,104	1,057
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	185	80
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0	5
Available-for-sale Securities, Debt Securities	1,289	1,132
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	0	0
Residential Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	1,731	1,468
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	57	43
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	6	8
Available-for-sale Securities, Debt Securities	1,782	1,503
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost	86	280
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	86	279
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	1
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	240	230
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	234	223
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	6	7
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	326	510
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	320	502
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	6	8
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	1,740	2,127
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	357	184
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	1	13
Available-for-sale Securities, Debt Securities	2,096	2,298
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost	189	963
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	188	950
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1	13
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	0	8
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	8
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	189	971
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	188	958
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	1	13
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	2	6
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost	1,817	8,096
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,793	7,858
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	25	238
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	1,566	1,501
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,498	1,406
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	68	93
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	3,383	9,597
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	3,291	9,264
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	93	331
Available-for-sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	2	6
Available-for-sale Equity Securities, Amortized Cost Basis	89
Available-for-sale Securities, Equity Securities	99	178
Available-for-sale Securities	25,724
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	0	0
Available-for-sale Equity Securities, Amortized Cost Basis		178
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost	27	83
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	25	79
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2	4
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	37	44
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	34	37
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	3	7
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	64	127
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	59	116
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	5	11
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Equity Securities, Amortized Cost Basis	0	293
Available-for-sale Securities, Equity Securities	$ 0	$ 281

Available-for-sale securities continuous unrealized loss position amortized cost.

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Available-for-sale securities continuous unrealized loss position twelve months or longer amortized cost.

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No definition available.

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Available-for-sale securities continuous unrealized loss position less than twelve months, amortized cost.

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Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as available-for-sale that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

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