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Investment Holding Level 4 Available-for-Sale Securities (Details) $ in Millions | Jun. 30, 2017 USD ($) securities | Dec. 31, 2016 USD ($)
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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

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- Definition Available-for-sale securities continuous unrealized loss position twelve months or longer amortized cost. + References No definition available. + Details
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- Definition Available-for-sale securities continuous unrealized loss position less than twelve months, amortized cost. + References No definition available. + Details
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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References No definition available. + Details
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