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]
Available-for-sale Debt Securities, Amortized Cost Basis	$ 55,742	$ 56,965
Available-for-sale Equity Securities, Amortized Cost Basis	812	1,135
Available-for-sale Securities, Amortized Cost Basis	56,554	57,807
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	4,650	2,892
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	4,730	2,930
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	168	658
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	185	699
Available-for-sale Securities, Debt Securities	60,225	59,196
Available-for-sale Securities, Equity Securities	875	1,121
Available-for-sale Securities		60,035
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	1,832	2,373
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	9,623	10,929
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	9,082	9,322
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	20,127	20,178
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	15,078	14,163
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	1,848	2,405
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	10,052	11,200
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	9,671	9,497
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	23,192	21,794
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	15,462	14,300
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	4,528	19,095
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	4,466	18,569
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	63	526
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	3,312	3,072
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	3,190	2,896
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	122	173
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	7,840	22,167
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	7,656	21,465
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 185	699
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions \| securities	3,022
Percentage of Gross Unrealized Losses Depressed Less than Twenty Percent of Cost or Amortized Cost	92.00%
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	$ 40,664	42,802
Available-for-sale Securities, Debt Securities	44,763	44,896
Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	2,683	2,520
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	35	24
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	33	45
Available-for-sale Securities, Debt Securities	2,685	2,499
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	321	1,619
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	320	1,609
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1	10
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	364	357
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	332	322
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	32	35
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	685	1,976
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	652	1,931
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	33	45
Collateralized Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	2,514	2,989
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	67	75
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	9	23
Available-for-sale Securities, Debt Securities	2,573	3,038
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	665	1,164
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	664	1,154
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2	10
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	1,028	1,243
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,021	1,227
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	7	13
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	1,693	2,407
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,685	2,381
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	9	23
Commercial Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	5,066	4,668
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	226	105
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	24	56
Available-for-sale Securities, Debt Securities	5,268	4,717
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	7	8
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	548	1,726
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	540	1,681
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	8	45
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	259	189
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	243	178
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	16	11
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	807	1,915
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	783	1,859
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	24	56
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	24,615	25,876
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	2,370	1,342
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	81	416
Available-for-sale Securities, Debt Securities	26,904	26,802
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	1,759	9,206
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,725	8,866
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	34	340
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	812	656
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	765	580
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	47	76
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	2,571	9,862
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	2,490	9,446
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	81	416
Foreign Government Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	1,106	1,321
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	83	34
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	3	47
Available-for-sale Securities, Debt Securities	1,186	1,308
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	105	679
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	104	646
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1	33
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	27	124
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	25	110
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	2	14
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	132	803
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	129	756
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	3	47
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	334	440
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	331	430
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	3	10
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	47	18
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	45	17
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	2	1
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	381	458
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	376	447
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	5	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	11,345	11,124
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	1,254	1,008
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	5	11
Available-for-sale Securities, Debt Securities	12,594	12,121
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	4,815	3,986
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	131	82
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	10	22
Available-for-sale Securities, Debt Securities	4,936	4,046
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	278	1,349
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	278	1,340
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	9
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	707	415
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	697	402
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	10	13
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	985	1,764
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	975	1,742
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	10	22
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	3,598	4,481
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	484	222
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	3	38
Available-for-sale Securities, Debt Securities	4,079	4,665
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	347	2,432
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	344	2,394
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	3	38
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	347	2,440
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	344	2,402
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	3	38
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	7	11
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	4,357	18,615
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	4,306	18,120
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	52	495
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	3,244	3,010
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	3,128	2,844
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	116	163
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	7,601	21,625
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	7,434	20,964
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	168	658
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Equity Securities, Amortized Cost Basis	812	842
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	80	38
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	17	41
Available-for-sale Securities, Equity Securities	875	839
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	171	480
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	160	449
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	11	31
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	68	62
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	62	52
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	6	10
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	239	542
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	222	501
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	17	41
Available-for-sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	61,100
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	7	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	$ 282

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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No definition available.

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Percentage of gross unrealized losses depressed less than twenty percent of cost or amortized cost.

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No definition available.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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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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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

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