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Investments - Investments - Available-for-Sale Securities (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | $ 35,913 | $ 35,612
Gross Unrealized Gains, fixed maturities, available-for-sale | 831 | 1,466
Gross Unrealized Losses, fixed maturities, available-for-sale | (550) | (114)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 36,194 | 36,964
Non-Credit OTTI | (4) | (5)
Equity securities, available-for-sale, Cost or Amortized Cost | 0 | 907
Equity securities, AFS | 0 | 1,012
Available-for-sale, Cost or Amortized Cost | 35,913 | 36,519
Available-for-sale, Gross Unrealized Gains | 831 | 1,587
Available-for-sale, Gross Unrealized Losses | (550) | (130)
Available-for-sale, Fair Value | 36,194 | 37,976
Amortized Cost |  |
One year or less | 1,321 | 1,507
Over one year through five years | 5,955 | 5,007
Over five years through ten years | 6,614 | 6,505
Over ten years | 13,203 | 13,928
Subtotal | 27,093 | 26,947
Mortgage-backed and asset-backed securities | 8,820 | 8,665
Fair Value |  |
One year or less | 1,326 | 1,513
Over one year through five years | 5,980 | 5,119
Over five years through ten years | 6,546 | 6,700
Over ten years | 13,558 | 14,866
Subtotal | 27,410 | 28,198
Mortgage-backed and asset-backed securities | 8,784 | 8,766
ABS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 993 | 1,119
Gross Unrealized Gains, fixed maturities, available-for-sale | 4 | 9
Gross Unrealized Losses, fixed maturities, available-for-sale | (3) | (2)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 994 | 1,126
Non-Credit OTTI | 0 | 0
CDOs |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 1,091 | 1,257
Gross Unrealized Gains, fixed maturities, available-for-sale | 1 | 3
Gross Unrealized Losses, fixed maturities, available-for-sale | (3) | 0
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 1,089 | 1,260
Non-Credit OTTI | 0 | 0
CMBS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 3,536 | 3,304
Gross Unrealized Gains, fixed maturities, available-for-sale | 31 | 58
Gross Unrealized Losses, fixed maturities, available-for-sale | (73) | (26)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 3,494 | 3,336
Non-Credit OTTI | (4) | (5)
Corporate |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 13,493 | 12,370
Gross Unrealized Gains, fixed maturities, available-for-sale | 192 | 490
Gross Unrealized Losses, fixed maturities, available-for-sale | (336) | (56)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 13,349 | 12,804
Non-Credit OTTI | 0 | 0
Foreign Govt./Govt. Agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 1,149 | 1,071
Gross Unrealized Gains, fixed maturities, available-for-sale | 12 | 43
Gross Unrealized Losses, fixed maturities, available-for-sale | (28) | (4)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 1,133 | 1,110
Non-Credit OTTI | 0 | 0
Municipal |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 10,678 | 11,743
Gross Unrealized Gains, fixed maturities, available-for-sale | 508 | 754
Gross Unrealized Losses, fixed maturities, available-for-sale | (44) | (12)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 11,142 | 12,485
Non-Credit OTTI | 0 | 0
RMBS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 3,200 | 2,985
Gross Unrealized Gains, fixed maturities, available-for-sale | 48 | 63
Gross Unrealized Losses, fixed maturities, available-for-sale | (41) | (4)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 3,207 | 3,044
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 | 1,773 | 1,763
Gross Unrealized Gains, fixed maturities, available-for-sale | 35 | 46
Gross Unrealized Losses, fixed maturities, available-for-sale | (22) | (10)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 1,786 | 1,799
Non-Credit OTTI | 0 | 0
Equity Securities, at fair value |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Non-Credit OTTI |  | 0
Equity securities, available-for-sale, Cost or Amortized Cost |  | 907
Gross Unrealized Gains, fixed maturities, available-for-sale |  | 121
Gross Unrealized Losses Gains, fixed maturities, available-for-sale |  | (16)
Equity securities, AFS |  | $ 1,012

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://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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