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Fair Value Measurements - Changes in balances of Level 3 financial assets carried at fair value (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | $ 1,725 | $ 1,519 | $ 1,636 | $ 1,355
Impact of accounting change |  |  |  | 0
Total realized/unrealized gains (losses) included in Net income | 0 | (6) | (28) | (20)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 7 | 4 | 52 | (7)
Purchases and issuances | 47 | 150 | 172 | 423
Sales and settlements | (51) | (26) | (161) | (114)
Transfer into Level 3 | 0 | 61 | 104 | 165
Transfer out of Level 3 | (11) | (11) | (58) | (111)
Financial assets, Ending Balance | 1,717 | 1,691 | 1,717 | 1,691
Fixed maturities |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 1,533 | 1,372 | 1,470 | 1,231
Impact of accounting change |  |  |  | 0
Total realized/unrealized gains (losses) included in Net income | (3) | (3) | (10) | (7)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 2 | 6 | 31 | (6)
Purchases and issuances | 37 | 143 | 146 | 367
Sales and settlements | (30) | (26) | (140) | (114)
Transfer into Level 3 | 0 | 61 | 89 | 165
Transfer out of Level 3 | (11) | (11) | (58) | (94)
Financial assets, Ending Balance | 1,528 | 1,542 | 1,528 | 1,542
U.S. government agency |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 8 | 15 | 15 | 15
Impact of accounting change |  |  |  | 0
Total realized/unrealized gains (losses) included in Net income | 0 | 0 | (8) | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0 | 1 | 0
Purchases and issuances | 0 | 0 | 0 | 0
Sales and settlements | 0 | 0 | 0 | 0
Transfer into Level 3 | 0 | 0 | 0 | 0
Transfer out of Level 3 | 0 | 0 | 0 | 0
Financial assets, Ending Balance | 8 | 15 | 8 | 15
State and municipal |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 91 | 84 | 89 | 100
Impact of accounting change |  |  |  | 0
Total realized/unrealized gains (losses) included in Net income | 0 | 0 | 0 | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 1 | 1 | 4 | (1)
Purchases and issuances | 0 | 9 | 0 | 34
Sales and settlements | (1) | (1) | (2) | (1)
Transfer into Level 3 | 0 | 0 | 0 | 0
Transfer out of Level 3 | 0 | 0 | 0 | (39)
Financial assets, Ending Balance | 91 | 93 | 91 | 93
Residential MBS |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 231 | 296 | 224 | 300
Impact of accounting change |  |  |  | 0
Total realized/unrealized gains (losses) included in Net income | (2) | (3) | 0 | (5)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | (1) | 1 | 0
Purchases and issuances | 0 | 0 | 0 | 0
Sales and settlements | (8) | (8) | (21) | (24)
Transfer into Level 3 | 0 | 10 | 33 | 67
Transfer out of Level 3 | (2) | 0 | (18) | (44)
Financial assets, Ending Balance | 219 | 294 | 219 | 294
Commercial MBS |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 36 | 48 | 39 | 44
Impact of accounting change |  |  |  | 0
Total realized/unrealized gains (losses) included in Net income | 0 | 0 | (1) | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | (1) | 0 | (1)
Purchases and issuances | 0 | 0 | 0 | 0
Sales and settlements | (2) | (1) | (4) | (1)
Transfer into Level 3 | 0 | 0 | 0 | 4
Transfer out of Level 3 | 0 | (1) | 0 | (1)
Financial assets, Ending Balance | 34 | 45 | 34 | 45
Asset-backed securities |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 478 | 332 | 470 | 226
Impact of accounting change |  |  |  | 0
Total realized/unrealized gains (losses) included in Net income | (1) | 0 | (1) | 1
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 4 | 0 | 1 | 0
Purchases and issuances | 0 | 110 | 15 | 230
Sales and settlements | (5) | (3) | (24) | (51)
Transfer into Level 3 | 0 | 20 | 41 | 53
Transfer out of Level 3 | (9) | (10) | (35) | (10)
Financial assets, Ending Balance | 467 | 449 | 467 | 449
Corporate and other |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 689 | 597 | 633 | 546
Impact of accounting change |  |  |  | 0
Total realized/unrealized gains (losses) included in Net income | 0 | 0 | 0 | (3)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | (3) | 7 | 24 | (4)
Purchases and issuances | 37 | 24 | 131 | 103
Sales and settlements | (14) | (13) | (89) | (37)
Transfer into Level 3 | 0 | 31 | 15 | 41
Transfer out of Level 3 | 0 | 0 | (5) | 0
Financial assets, Ending Balance | 709 | 646 | 709 | 646
Equity securities |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 166 | 118 | 140 | 93
Impact of accounting change |  |  |  | 0
Total realized/unrealized gains (losses) included in Net income | 5 | 0 | (12) | (4)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 5 | (2) | 21 | (1)
Purchases and issuances | 10 | 7 | 22 | 52
Sales and settlements | (21) | 0 | (21) | 0
Transfer into Level 3 | 0 | 0 | 15 | 0
Transfer out of Level 3 | 0 | 0 | 0 | (17)
Financial assets, Ending Balance | 165 | 123 | 165 | 123
Assets of MIE |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 26 | 29 | 26 | 31
Impact of accounting change |  |  |  | 0
Total realized/unrealized gains (losses) included in Net income | (2) | (3) | (6) | (9)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0 | 0 | 0
Purchases and issuances | 0 | 0 | 4 | 4
Sales and settlements | 0 | 0 | 0 | 0
Transfer into Level 3 | 0 | 0 | 0 | 0
Transfer out of Level 3 | 0 | 0 | 0 | 0
Financial assets, Ending Balance | $ 24 | $ 26 | $ 24 | $ 26

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