Investment Holding Level 4 Available-for-Sale Securities (Details) $ in Millions	Dec. 31, 2017 USD ($) security	Dec. 31, 2016 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	$ 20,914	$ 22,507
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	1,958	1,516
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(73)	(204)
Available-for-sale Securities, Debt Securities	22,799	23,819
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	1	1
Available-for-sale Equity Securities, Amortized Cost Basis	140	142
Equity securities, AFS	154	152
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	844	722
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	850	727
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	3,498	4,184
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	3,580	4,301
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	3,178	3,562
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	3,321	3,649
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	8,238	8,258
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	9,830	9,303
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	15,758	16,726
Available-for-sale Securities, Debt Maturities, Single Maturity Date	17,581	17,980
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	5,156	5,781
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	$ 5,218	5,839
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions \| security	1,254
Percentage of Gross Unrealized Losses Depressed Less than Twenty Percent of Cost or Amortized Cost	93.00%
Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	$ 821	1,011
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	9	9
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(11)	(27)
Available-for-sale Securities, Debt Securities	819	993
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, Accumulated Loss [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost	158	249
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	157	248
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1	1
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	219	265
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	209	239
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	10	26
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	377	514
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	366	487
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	11	27
Collateralized Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	886	893
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	2	49
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0	(2)
Available-for-sale Securities, Debt Securities	888	940
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, Accumulated Loss [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost	242	325
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	242	325
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	37	210
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	37	208
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	2
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	279	535
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	279	533
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0	2
Commercial Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	2,061	2,135
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	45	45
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(22)	(34)
Available-for-sale Securities, Debt Securities	2,084	2,146
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	1	1
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost	524	1,058
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	517	1,030
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	7	28
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	346	139
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	331	133
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	15	6
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	870	1,197
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	848	1,163
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	22	34
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	12,587	13,677
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	1,483	1,111
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(32)	(95)
Available-for-sale Securities, Debt Securities	14,038	14,693
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, Accumulated Loss [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost	1,082	2,535
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,074	2,464
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	8	71
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	779	402
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	755	378
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	24	24
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	1,861	2,937
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,829	2,842
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	32	95
Foreign Government Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Securities	407	345
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost	60	164
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	59	155
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1	9
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	35	6
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	34	5
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1	1
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	95	170
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	93	160
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	2	10
Municipal Bonds [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost	9	166
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	9	160
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	6
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	10	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	9	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1	0
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	19	166
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	18	160
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	1	6
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Securities	1,266	1,189
Residential Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	1,388	1,742
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	41	34
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(2)	(16)
Available-for-sale Securities, Debt Securities	1,427	1,760
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, Accumulated Loss [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost	288	548
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	287	535
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	28	198
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	27	195
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	316	746
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	314	730
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	2	16
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	1,667	1,614
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	206	153
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(3)	(14)
Available-for-sale Securities, Debt Securities	1,870	1,753
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, Accumulated Loss [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost	382	385
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	380	371
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2	14
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	38	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	37	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1	0
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	420	385
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	417	371
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	3	14
Debt Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost	2,745	5,430
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	2,725	5,288
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	20	142
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	1,492	1,220
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,439	1,158
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	53	62
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	4,237	6,650
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	4,164	6,446
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	73	204
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	140	142
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	14	12
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	0	2
Equity securities, AFS	154	152
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost	6	59
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	6	57
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	2
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	3	5
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	3	5
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	9	64
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	9	62
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0	2
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	1	1
Equity securities, AFS	154
Available-for-sale Securities, Amortized Cost Basis	21,054	22,649
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	1,972	1,528
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	73	206
Available-for-sale Securities	22,953	23,971
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost	2,751	5,489
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	2,731	5,345
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	20	144
Available-for-sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost	1,495	1,225
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,442	1,163
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	53	62
Available-for-sale Securities Continuous Unrealized Loss Position Amortized Cost	4,246	6,714
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	4,173	6,508
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	73	206
Foreign Government Debt [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	379
Available-for-sale Securities, Debt Securities	407
Foreign Government Debt [Member] \| Foreign Government Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis		337
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	30	18
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(2)	(10)
Available-for-sale Securities, Debt Securities		345
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	0	0
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	1,125
Available-for-sale Securities, Debt Securities	1,266
US States and Political Subdivisions Debt Securities [Member] \| US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis		1,098
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	142	97
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(1)	(6)
Available-for-sale Securities, Debt Securities		1,189
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 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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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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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This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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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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This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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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 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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