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Investments - Investments - Available-for-Sale Securities (Details) - USD ($) | Sep. 30, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | $ 36,094,000,000 | $ 35,612,000,000
Gross Unrealized Gains, fixed maturities, available-for-sale | 679,000,000 | 1,466,000,000
Gross Unrealized Losses, fixed maturities, available-for-sale | (607,000,000) | (114,000,000)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 36,166,000,000 | 36,964,000,000
Non-Credit OTTI | (5,000,000) | (5,000,000)
Equity securities, available-for-sale, Cost or Amortized Cost | 0 | 907,000,000
Equity securities, AFS | 0 | 1,012,000,000
Available-for-sale, Cost or Amortized Cost | 36,094,000,000 | 36,519,000,000
Available-for-sale, Gross Unrealized Gains | 679,000,000 | 1,587,000,000
Available-for-sale, Gross Unrealized Losses | (607,000,000) | (130,000,000)
Available-for-sale, Fair Value | 36,166,000,000 | 37,976,000,000
Amortized Cost |  |
One year or less | 1,033,000,000 | 1,507,000,000
Over one year through five years | 6,233,000,000 | 5,007,000,000
Over five years through ten years | 6,543,000,000 | 6,505,000,000
Over ten years | 12,922,000,000 | 13,928,000,000
Subtotal | 26,731,000,000 | 26,947,000,000
Mortgage-backed and asset-backed securities | 9,363,000,000 | 8,665,000,000
Fair Value |  |
One year or less | 1,037,000,000 | 1,513,000,000
Over one year through five years | 6,242,000,000 | 5,119,000,000
Over five years through ten years | 6,469,000,000 | 6,700,000,000
Over ten years | 13,126,000,000 | 14,866,000,000
Subtotal | 26,874,000,000 | 28,198,000,000
Mortgage-backed and asset-backed securities | 9,292,000,000 | 8,766,000,000
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure | 0 | 0
ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 1,191,000,000 | 1,119,000,000
Gross Unrealized Gains, fixed maturities, available-for-sale | 3,000,000 | 9,000,000
Gross Unrealized Losses, fixed maturities, available-for-sale | (3,000,000) | (2,000,000)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 1,191,000,000 | 1,126,000,000
Non-Credit OTTI | 0 | 0
CLOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 1,328,000,000 | 1,257,000,000
Gross Unrealized Gains, fixed maturities, available-for-sale | 1,000,000 | 3,000,000
Gross Unrealized Losses, fixed maturities, available-for-sale | (3,000,000) | 0
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 1,326,000,000 | 1,260,000,000
Non-Credit OTTI | 0 | 0
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 3,718,000,000 | 3,304,000,000
Gross Unrealized Gains, fixed maturities, available-for-sale | 25,000,000 | 58,000,000
Gross Unrealized Losses, fixed maturities, available-for-sale | (86,000,000) | (26,000,000)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 3,657,000,000 | 3,336,000,000
Non-Credit OTTI | (5,000,000) | (5,000,000)
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 13,640,000,000 | 12,370,000,000
Gross Unrealized Gains, fixed maturities, available-for-sale | 176,000,000 | 490,000,000
Gross Unrealized Losses, fixed maturities, available-for-sale | (324,000,000) | (56,000,000)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 13,492,000,000 | 12,804,000,000
Non-Credit OTTI | 0 | 0
Foreign Govt./Govt. Agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 961,000,000 | 1,071,000,000
Gross Unrealized Gains, fixed maturities, available-for-sale | 11,000,000 | 43,000,000
Gross Unrealized Losses, fixed maturities, available-for-sale | (20,000,000) | (4,000,000)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 952,000,000 | 1,110,000,000
Non-Credit OTTI | 0 | 0
Municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 10,276,000,000 | 11,743,000,000
Gross Unrealized Gains, fixed maturities, available-for-sale | 402,000,000 | 754,000,000
Gross Unrealized Losses, fixed maturities, available-for-sale | (76,000,000) | (12,000,000)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 10,602,000,000 | 12,485,000,000
Non-Credit OTTI | 0 | 0
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 3,126,000,000 | 2,985,000,000
Gross Unrealized Gains, fixed maturities, available-for-sale | 44,000,000 | 63,000,000
Gross Unrealized Losses, fixed maturities, available-for-sale | (52,000,000) | (4,000,000)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 3,118,000,000 | 3,044,000,000
Non-Credit OTTI | 0 | 0
U.S. Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 1,854,000,000 | 1,763,000,000
Gross Unrealized Gains, fixed maturities, available-for-sale | 17,000,000 | 46,000,000
Gross Unrealized Losses, fixed maturities, available-for-sale | (43,000,000) | (10,000,000)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 1,828,000,000 | 1,799,000,000
Non-Credit OTTI | 0 | 0
Equity Securities, at fair value |  |
Debt Securities, Available-for-sale [Line Items] |  |
Non-Credit OTTI |  | 0
Equity securities, available-for-sale, Cost or Amortized Cost |  | 907,000,000
Gross Unrealized Gains, fixed maturities, available-for-sale |  | 121,000,000
Gross Unrealized Losses Gains, fixed maturities, available-for-sale |  | (16,000,000)
Equity securities, AFS |  | $ 1,012,000,000

X
- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 9A -URI http://asc.fasb.org/extlink&oid=109979856&loc=SL6284427-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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