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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | $ 1,976 | $ 1,771 | $ 1,762 | $ 1,636
Total realized/unrealized gains (losses) included in Net income | (13) | (8) | (18) | (28)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 15 | 25 | 29 | 45
Purchases and issuances | 193 | 23 | 432 | 125
Sales and settlements | (79) | (87) | (136) | (110)
Transfer into Level 3 | 32 | 32 | 89 | 104
Transfer out of Level 3 | (133) | (31) | (167) | (47)
Financial assets, Ending Balance | 1,991 | 1,725 | 1,991 | 1,725
Fixed maturities |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 1,777 | 1,589 | 1,559 | 1,470
Total realized/unrealized gains (losses) included in Net income | 2 | (6) | 4 | (7)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 9 | 17 | 16 | 29
Purchases and issuances | 183 | 19 | 408 | 109
Sales and settlements | (76) | (87) | (133) | (110)
Transfer into Level 3 | 32 | 32 | 89 | 89
Transfer out of Level 3 | (127) | (31) | (143) | (47)
Financial assets, Ending Balance | 1,800 | 1,533 | 1,800 | 1,533
U.S. government agency |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 8 | 15 | 8 | 15
Total realized/unrealized gains (losses) included in Net income | 0 | (8) | 0 | (8)
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 | 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 | 8 | 8 | 8
State and municipal |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 143 | 92 | 140 | 89
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 | 0 | 4 | 3
Purchases and issuances | 0 | 0 | 0 | 0
Sales and settlements | (1) | (1) | (1) | (1)
Transfer into Level 3 | 0 | 0 | 0 | 0
Transfer out of Level 3 | 0 | 0 | 0 | 0
Financial assets, Ending Balance | 143 | 91 | 143 | 91
Residential MBS |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 175 | 213 | 190 | 224
Total realized/unrealized gains (losses) included in Net income | (3) | 1 | (2) | 2
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 2 | 1 | 2 | 1
Purchases and issuances | 0 | 0 | 1 | 0
Sales and settlements | (23) | (6) | (31) | (13)
Transfer into Level 3 | 13 | 22 | 20 | 33
Transfer out of Level 3 | (11) | 0 | (27) | (16)
Financial assets, Ending Balance | 153 | 231 | 153 | 231
Commercial MBS |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 29 | 38 | 25 | 39
Total realized/unrealized gains (losses) included in Net income | 1 | (1) | 1 | (1)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0 | 0 | 0
Purchases and issuances | 15 | 0 | 15 | 0
Sales and settlements | 0 | (1) | 0 | (2)
Transfer into Level 3 | 0 | 0 | 4 | 0
Transfer out of Level 3 | 0 | 0 | 0 | 0
Financial assets, Ending Balance | 45 | 36 | 45 | 36
Asset-backed securities |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 594 | 501 | 484 | 470
Total realized/unrealized gains (losses) included in Net income | 0 | 0 | 0 | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 2 | 3 | 2 | (3)
Purchases and issuances | 0 | 11 | 104 | 15
Sales and settlements | (25) | (11) | (36) | (19)
Transfer into Level 3 | 19 | 0 | 36 | 41
Transfer out of Level 3 | (92) | (26) | (92) | (26)
Financial assets, Ending Balance | 498 | 478 | 498 | 478
Corporate and other |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 828 | 730 | 712 | 633
Total realized/unrealized gains (losses) included in Net income | 4 | 2 | 5 | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 4 | 12 | 8 | 27
Purchases and issuances | 168 | 8 | 288 | 94
Sales and settlements | (27) | (68) | (65) | (75)
Transfer into Level 3 | 0 | 10 | 29 | 15
Transfer out of Level 3 | (24) | (5) | (24) | (5)
Financial assets, Ending Balance | 953 | 689 | 953 | 689
Equity securities |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 173 | 158 | 174 | 140
Total realized/unrealized gains (losses) included in Net income | (10) | 0 | (16) | (17)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 6 | 8 | 13 | 16
Purchases and issuances | 8 | 0 | 20 | 12
Sales and settlements | (3) | 0 | (3) | 0
Transfer into Level 3 | 0 | 0 | 0 | 15
Transfer out of Level 3 | (6) | 0 | (20) | 0
Financial assets, Ending Balance | 168 | 166 | 168 | 166
Assets of MIE |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance | 26 | 24 | 29 | 26
Total realized/unrealized gains (losses) included in Net income | (5) | (2) | (6) | (4)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0 | 0 | 0
Purchases and issuances | 2 | 4 | 4 | 4
Sales and settlements | 0 | 0 | 0 | 0
Transfer into Level 3 | 0 | 0 | 0 | 0
Transfer out of Level 3 | 0 | 0 | (4) | 0
Financial assets, Ending Balance | $ 23 | $ 26 | $ 23 | $ 26

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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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