Investment Holding Level 4 Available-for-Sale Securities (Details) $ in Millions	Mar. 31, 2017 USD ($) securities	Dec. 31, 2016 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	$ 53,908	$ 53,805
Available-for-sale Equity Securities, Amortized Cost Basis	1,135	1,020
Available-for-sale Securities, Amortized Cost Basis	54,919	54,825
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	2,806	2,704
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	107	96
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	388	506
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	18	19
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	406	525
Available-for-sale Securities, Debt Securities	56,326	56,003
Available-for-sale Securities, Equity Securities	1,223	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	1,693	1,896
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	9,145	9,015
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	9,079	9,038
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	20,560	19,962
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	13,431	13,894
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	1,709	1,912
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	9,422	9,289
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	9,325	9,245
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	22,274	21,556
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	13,596	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	12,664	14,274
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	12,356	13,868
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	308	406
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	2,288	2,565
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	2,190	2,446
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	98	119
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	14,952	16,839
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	14,546	16,314
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 406	525
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions \| securities	3,528
Percentage of Gross Unrealized Losses Depressed Less than Twenty Percent of Cost or Amortized Cost	94.00%
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	$ 40,477	39,911
Available-for-sale Securities, Debt Securities	42,730	42,002
Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	2,267	2,396
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	20	17
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	22	31
Available-for-sale Securities, Debt Securities	2,265	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	544	582
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	542	579
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2	3
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	276	368
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	256	340
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	20	28
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	820	950
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	798	919
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	22	31
Collateralized Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	2,243	1,853
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	71	67
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	3	4
Available-for-sale Securities, Debt Securities	2,311	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	1,253	641
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,251	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	284	370
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	283	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	1,537	1,011
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,534	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	5,055	4,907
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	102	97
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	58	68
Available-for-sale Securities, Debt Securities	5,099	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	1,804	2,076
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,764	2,027
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	40	49
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	309	293
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	291	274
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	18	19
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	2,113	2,369
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	2,055	2,301
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	58	68
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	24,371	24,380
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	1,548	1,510
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	189	224
Available-for-sale Securities, Debt Securities	25,730	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	4,813	5,418
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	4,671	5,248
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	142	170
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	865	835
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	818	781
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	47	54
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	5,678	6,253
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	5,489	6,029
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	189	224
Foreign Government Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	1,151	1,164
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	48	33
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	12	26
Available-for-sale Securities, Debt Securities	1,187	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	350	573
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	341	550
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	9	23
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	36	27
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	33	24
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	3	3
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	386	600
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	374	574
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	12	26
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	1,372	1,567
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,318	1,498
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	54	69
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	35	43
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	34	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	1,407	1,610
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,352	1,539
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	55	71
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	11,076	10,825
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	759	732
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	55	71
Available-for-sale Securities, Debt Securities	11,780	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	3,866	4,738
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	69	66
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	14	37
Available-for-sale Securities, Debt Securities	3,921	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	865	1,655
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	856	1,624
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	9	31
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	453	591
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	448	585
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	5	6
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	1,318	2,246
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,304	2,209
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	14	37
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	3,879	3,542
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	189	182
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	35	45
Available-for-sale Securities, Debt Securities	4,033	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	1,425	1,432
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,390	1,387
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	35	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	1,425	1,432
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,390	1,387
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	35	45
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	12,426	13,944
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	12,133	13,553
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	293	391
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	2,258	2,527
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	2,163	2,412
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	95	115
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	14,684	16,471
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	14,296	15,965
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	388	506
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, Continuous Unrealized Loss Position, Fair Value [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost	238	330
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	223	315
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	15	15
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	30	38
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	27	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	268	368
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	250	349
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	18	19
Available-for-sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Equity Securities, Amortized Cost Basis	1,011	1,020
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	2,913	2,800
Available-for-sale Securities, Equity Securities	1,100	1,097
Available-for-sale Securities	57,426	57,100
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	7	6
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Equity Securities, Amortized Cost Basis	124
Available-for-sale Securities, Equity Securities	$ 123	$ 0

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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