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Investments - Available-for-Sale Securities (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | $ 35,612 | $ 31,296
Gross Unrealized Gains, fixed maturities, available-for-sale | 1,466 | 1,188
Gross Unrealized Losses, fixed maturities, available-for-sale | (114) | (302)
Total fixed maturities | 36,964 | 32,182
Non-Credit OTTI | (5) | (5)
Equity securities, available-for-sale, Cost or Amortized Cost | 907 | 878
Equity securities, AFS | 1,012 | 945
Available-for-sale, Cost or Amortized Cost | 36,519 | 32,174
Available-for-sale, Gross Unrealized Gains | 1,587 | 1,272
Available-for-sale, Gross Unrealized Losses | (130) | (319)
Available-for-sale, Fair Value | 37,976 | 33,127
Amortized Cost |  |
One year or less | 1,507 | 1,174
Over one year through five years | 5,007 | 4,830
Over five years through ten years | 6,505 | 5,476
Over ten years | 13,928 | 11,704
Subtotal | 26,947 | 23,184
Mortgage-backed and asset-backed securities | 8,665 | 8,112
Fair Value |  |
One year or less | 1,513 | 1,185
Over one year through five years | 5,119 | 4,987
Over five years through ten years | 6,700 | 5,596
Over ten years | 14,866 | 12,253
Subtotal | 28,198 | 24,021
Mortgage-backed and asset-backed securities | 8,766 | 8,161
ABS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 1,119 | 1,385
Gross Unrealized Gains, fixed maturities, available-for-sale | 9 | 8
Gross Unrealized Losses, fixed maturities, available-for-sale | (2) | (4)
Total fixed maturities | 1,126 | 1,389
Non-Credit OTTI | 0 | 0
CDOs |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 1,257 | 960
Gross Unrealized Gains, fixed maturities, available-for-sale | 3 | 18
Gross Unrealized Losses, fixed maturities, available-for-sale | 0 | (2)
Total fixed maturities | 1,260 | 976
Non-Credit OTTI | 0 | 0
CMBS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 3,304 | 2,772
Gross Unrealized Gains, fixed maturities, available-for-sale | 58 | 52
Gross Unrealized Losses, fixed maturities, available-for-sale | (26) | (34)
Total fixed maturities | 3,336 | 2,790
Non-Credit OTTI | (5) | (5)
Corporate |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 12,370 | 10,703
Gross Unrealized Gains, fixed maturities, available-for-sale | 490 | 399
Gross Unrealized Losses, fixed maturities, available-for-sale | (56) | (129)
Total fixed maturities | 12,804 | 10,973
Non-Credit OTTI | 0 | 0
Foreign government/government agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 1,071 | 827
Gross Unrealized Gains, fixed maturities, available-for-sale | 43 | 15
Gross Unrealized Losses, fixed maturities, available-for-sale | (4) | (16)
Total fixed maturities | 1,110 | 826
Non-Credit OTTI | 0 | 0
Municipal |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 11,743 | 9,727
Gross Unrealized Gains, fixed maturities, available-for-sale | 754 | 635
Gross Unrealized Losses, fixed maturities, available-for-sale | (12) | (65)
Total fixed maturities | 12,485 | 10,297
Non-Credit OTTI | 0 | 0
RMBS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 2,985 | 2,995
Gross Unrealized Gains, fixed maturities, available-for-sale | 63 | 32
Gross Unrealized Losses, fixed maturities, available-for-sale | (4) | (21)
Total fixed maturities | 3,044 | 3,006
Non-Credit OTTI | 0 | 0
U.S. Treasuries |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 1,763 | 1,927
Gross Unrealized Gains, fixed maturities, available-for-sale | 46 | 29
Gross Unrealized Losses, fixed maturities, available-for-sale | (10) | (31)
Total fixed maturities | 1,799 | 1,925
Non-Credit OTTI | 0 | 0
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Non-Credit OTTI | 0 | 0
Equity securities, available-for-sale, Cost or Amortized Cost | 907 | 878
Gross Unrealized Gains, fixed maturities, available-for-sale | 121 | 84
Gross Unrealized Losses Gains, fixed maturities, available-for-sale | (16) | (17)
Equity securities, AFS | $ 1,012 | $ 945

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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 45 -Paragraph 9A -URI http://asc.fasb.org/extlink&oid=82896770&loc=SL6284427-111562 Reference 2: 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=82897076&loc=d3e27161-111563 Reference 3: 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=84228862&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=82897076&loc=d3e27161-111563 + Details
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