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Fair Value - Reconciliations of Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Derivative Instruments [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Derivative financial instruments, net, Beginning balance | $ 1 |  | $ 3 |
Derivative financial instruments, net, Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss) | (1) |  | (4) |
Derivative financial instruments, net, Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in OCI | 0 |  | 0 |
Derivative financial instruments, net, Purchases | 0 |  | 0 |
Derivative financial instruments, net, Sales |  |  | (2) |
Derivative financial instruments, net, Settlements | 0 |  | 0 |
Derivative financial instruments, net, Transfers into Level 3 |  |  | 3 |
Derivative financial instruments, net, Transfers out of Level 3 | 0 |  | 0 |
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at September 30 |  |  | (3) |
Corporate and Other Bonds [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 242 | $ 141 | 168 | $ 162
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss) | 1 |  | 1 | (1)
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in OCI | 7 |  | 14 | (1)
Purchases | 16 | 27 | 163 | 39
Sales |  | (1) | (36) | (13)
Settlements | (5) | (11) | (15) | (32)
Transfers into Level 3 |  |  |  | 37
Transfers out of Level 3 |  | (3) | (34) | (38)
Ending balance | 261 | 153 | 261 | 153
States, Municipalities and Political Subdivisions [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 2 | 85 | 2 | 94
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss) |  |  |  | 1
Settlements | (1) |  | (1) | (10)
Transfers out of Level 3 |  | (24) |  | (24)
Ending balance | 1 | 61 | 1 | 61
Residential Mortgage-Backed [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 134 | 207 | 134 | 189
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss) |  | 2 | 2 | 4
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in OCI | (1) | (2) | (2) | (4)
Purchases | 5 | 4 | 15 | 76
Settlements | (1) | (7) | (10) | (28)
Transfers out of Level 3 | (58) |  | (60) | (33)
Ending balance | 79 | 204 | 79 | 204
Commercial Mortgage-Backed [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 11 | 87 | 22 | 83
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss) |  | 5 |  | 7
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in OCI |  | (4) |  | (4)
Purchases | 23 | 8 | 32 | 23
Settlements | (8) | (15) | (17) | (17)
Transfers into Level 3 |  |  | 3 | 17
Transfers out of Level 3 | (2) | (10) | (16) | (38)
Ending balance | 24 | 71 | 24 | 71
Other Asset-Backed [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 45 | 490 | 53 | 655
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss) |  |  |  | 3
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in OCI |  | (6) | 2 | 4
Purchases | 34 | 43 | 69 | 125
Sales |  | (20) | (25) | (254)
Settlements |  | (32) | (1) | (52)
Transfers into Level 3 |  |  | 2 |
Transfers out of Level 3 | (36) | (4) | (57) | (10)
Ending balance | 43 | 471 | 43 | 471
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at September 30 |  |  |  | (1)
Total Asset-Backed [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 190 | 784 | 209 | 927
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss) |  | 7 | 2 | 14
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in OCI | (1) | (12) |  | (4)
Purchases | 62 | 55 | 116 | 224
Sales |  | (20) | (25) | (254)
Settlements | (9) | (54) | (28) | (97)
Transfers into Level 3 |  |  | 5 | 17
Transfers out of Level 3 | (96) | (14) | (133) | (81)
Ending balance | 146 | 746 | 146 | 746
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at September 30 |  |  |  | (1)
Total Fixed Maturities Available-for-Sale [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 434 | 1,010 | 379 | 1,183
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss) | 1 | 7 | 3 | 14
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in OCI | 6 | (12) | 14 | (5)
Purchases | 78 | 82 | 279 | 263
Sales |  | (21) | (61) | (267)
Settlements | (15) | (65) | (44) | (139)
Transfers into Level 3 |  |  | 5 | 54
Transfers out of Level 3 | (96) | (41) | (167) | (143)
Ending balance | 408 | 960 | 408 | 960
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at September 30 |  |  |  | (1)
Fixed Maturities Trading [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 6 | 89 | 85 | 90
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss) |  | (2) | 5 | (2)
Purchases |  |  | 2 |
Sales |  | (1) | (86) | (2)
Ending balance | 6 | 86 | 6 | 86
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at September 30 | (1) | (2) | 3 | (2)
Fixed Maturity Securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 440 | 1,099 | 464 | 1,273
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss) | 1 | 5 | 8 | 12
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in OCI | 6 | (12) | 14 | (5)
Purchases | 78 | 82 | 281 | 263
Sales |  | (22) | (147) | (269)
Settlements | (15) | (65) | (44) | (139)
Transfers into Level 3 |  |  | 5 | 54
Transfers out of Level 3 | (96) | (41) | (167) | (143)
Ending balance | 414 | 1,046 | 414 | 1,046
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at September 30 | (1) | (2) | 3 | (3)
Equity Securities Available-for-Sale [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 19 | 16 | 20 | 16
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss) | (1) |  | (1) |
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in OCI | 1 | (1) |  | (1)
Ending balance | 19 | 15 | 19 | 15
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at September 30 | (2) |  | (2) |
Equity Securities Trading [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 2 | 1 | 1 | 1
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss) |  | 1 | 1 | 1
Purchases | (1) |  |  |
Sales |  | (2) | (1) | (2)
Ending balance | 1 |  | 1 |
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at September 30 | (1) | 1 |  | 1
Equity Securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 21 | 17 | 21 | 17
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss) | (1) | 1 |  | 1
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in OCI | 1 | (1) |  | (1)
Purchases | (1) |  |  |
Sales |  | (2) | (1) | (2)
Ending balance | 20 | 15 | 20 | 15
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at September 30 | (3) | 1 | (2) | 1
Life Settlement Contracts [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 67 | 75 | 74 | 82
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss) |  | 5 | 10 | 22
Settlements |  | (6) | (17) | (30)
Ending balance | $ 67 | 74 | 67 | 74
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at September 30 |  | $ 2 | $ 2 | $ 1

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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of sales of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 + Details
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- Definition Amount of transfers of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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