Investment Holding Level 4 Available-for-Sale Securities (Details) $ in Millions	Jun. 30, 2017 USD ($) securities	Dec. 31, 2016 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	$ 54,800	$ 53,805
Available-for-sale Equity Securities, Amortized Cost Basis	964	1,020
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	3,261	2,704
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	111	96
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	227	506
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	(20)	(19)
Available-for-sale Securities, Debt Securities	57,834	56,003
Available-for-sale Securities, Equity Securities	1,055	1,097
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	7	6
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	2,113	1,896
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	8,954	9,015
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	9,282	9,038
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	20,458	19,962
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	13,993	13,894
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	2,132	1,912
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	9,224	9,289
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	9,627	9,245
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	22,648	21,556
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	14,203	14,001
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	10,748	14,274
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	10,585	13,868
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	163	406
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	1,897	2,565
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,813	2,446
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	84	119
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	12,645	16,839
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	12,398	16,314
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 247	525
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions \| securities	2,788
Percentage of Gross Unrealized Losses Depressed Less than Twenty Percent of Cost or Amortized Cost	94.00%
Debt Securities [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	$ 10,558	13,944
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	10,412	13,553
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	146	391
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	1,872	2,527
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,791	2,412
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	81	115
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	12,430	16,471
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	12,203	15,965
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	227	506
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	960	1,567
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	932	1,498
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	28	69
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	8	43
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	7	41
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1	2
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	968	1,610
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	939	1,539
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	29	71
Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	2,350	2,396
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	21	17
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	17	31
Available-for-sale Securities, Debt Securities	2,354	2,382
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	637	582
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	636	579
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1	3
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	229	368
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	213	340
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	16	28
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	866	950
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	849	919
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	17	31
Collateralized Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	2,427	1,853
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	33	67
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	3	4
Available-for-sale Securities, Debt Securities	2,457	1,916
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	1,432	641
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,430	640
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2	1
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	184	370
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	183	367
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	1,616	1,011
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,613	1,007
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	3	4
Commercial Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	5,085	4,907
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	127	97
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	39	68
Available-for-sale Securities, Debt Securities	5,173	4,936
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	7	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	1,438	2,076
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,412	2,027
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	26	49
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	157	293
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	144	274
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	13	19
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	1,595	2,369
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,556	2,301
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	39	68
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	24,307	24,380
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	1,842	1,510
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	105	224
Available-for-sale Securities, Debt Securities	26,044	25,666
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	3,442	5,418
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	3,381	5,248
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	61	170
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	1,085	835
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,041	781
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	44	54
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	4,527	6,253
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	4,422	6,029
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	105	224
Foreign Government Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	1,249	1,164
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	56	33
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	8	26
Available-for-sale Securities, Debt Securities	1,297	1,171
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	270	573
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	266	550
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	4	23
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	53	27
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	49	24
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	4	3
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	323	600
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	315	574
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	8	26
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	11,461	10,825
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	852	732
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	29	71
Available-for-sale Securities, Debt Securities	12,284	11,486
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	4,131	4,738
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	95	66
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	7	37
Available-for-sale Securities, Debt Securities	4,219	4,767
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	635	1,655
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	630	1,624
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	5	31
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	156	591
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	154	585
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	2	6
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	791	2,246
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	784	2,209
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	7	37
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	3,790	3,542
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	235	182
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	19	45
Available-for-sale Securities, Debt Securities	4,006	3,679
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	1,744	1,432
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,725	1,387
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	19	45
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	1,744	1,432
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,725	1,387
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	19	45
Equity Securities [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	190	330
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	173	315
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	17	15
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	25	38
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	22	34
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	3	4
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	215	368
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	195	349
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	20	19
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 Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Equity Securities, Amortized Cost Basis	964	1,020
Available-for-sale Securities, Amortized Cost Basis	55,764	54,825
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	3,372	2,800
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	247	525
Available-for-sale Securities, Equity Securities	1,055	1,097
Available-for-sale Securities	58,889	57,100
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	7	6
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	40,807	39,911
Available-for-sale Securities, Debt Securities	$ 43,631	$ 42,002

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

No definition available.

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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 gain in accumulated other comprehensive income (AOCI) on investments in debt and 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 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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

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