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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
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Financial assets, Beginning Balance | $ 2,290 | $ 1,762
Total realized/unrealized gains (losses) included in Net income | (13) | (5)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | (12) | 14
Purchases and issuances | 466 | 239
Sales and settlements | (79) | (57)
Transfer into Level 3 | 36 | 57
Transfer out of Level 3 | (88) | (34)
Financial assets, Ending Balance | 2,600 | 1,976
Fixed maturities |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Financial assets, Beginning Balance | 2,102 | 1,559
Total realized/unrealized gains (losses) included in Net income | (6) | 2
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | (12) | 7
Purchases and issuances | 454 | 225
Sales and settlements | (75) | (57)
Transfer into Level 3 | 7 | 57
Transfer out of Level 3 | (88) | (16)
Financial assets, Ending Balance | 2,382 | 1,777
U.S. government agency |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Financial assets, Beginning Balance | 8 | 8
Total realized/unrealized gains (losses) included in Net income | 0 | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0
Purchases and issuances | 0 | 0
Sales and settlements | 0 | 0
Transfer into Level 3 | 0 | 0
Transfer out of Level 3 | 0 | 0
Financial assets, Ending Balance | 8 | 8
State and municipal |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Financial assets, Beginning Balance | 148 | 140
Total realized/unrealized gains (losses) included in Net income | 0 | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | (1) | 3
Purchases and issuances | 0 | 0
Sales and settlements | (1) | 0
Transfer into Level 3 | 0 | 0
Transfer out of Level 3 | (84) | 0
Financial assets, Ending Balance | 62 | 143
Residential MBS |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Financial assets, Beginning Balance | 122 | 190
Total realized/unrealized gains (losses) included in Net income | (4) | 1
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0
Purchases and issuances | 0 | 1
Sales and settlements | (6) | (8)
Transfer into Level 3 | 7 | 7
Transfer out of Level 3 | (4) | (16)
Financial assets, Ending Balance | 115 | 175
Commercial MBS |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Financial assets, Beginning Balance | 36 | 25
Total realized/unrealized gains (losses) included in Net income | (1) | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0
Purchases and issuances | 12 | 0
Sales and settlements | 0 | 0
Transfer into Level 3 | 0 | 4
Transfer out of Level 3 | 0 | 0
Financial assets, Ending Balance | 47 | 29
Asset-backed securities |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Financial assets, Beginning Balance | 744 | 484
Total realized/unrealized gains (losses) included in Net income | (2) | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 3 | 0
Purchases and issuances | 204 | 104
Sales and settlements | (37) | (11)
Transfer into Level 3 | 0 | 17
Transfer out of Level 3 | 0 | 0
Financial assets, Ending Balance | 912 | 594
Corporate and other |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Financial assets, Beginning Balance | 1,044 | 712
Total realized/unrealized gains (losses) included in Net income | 1 | 1
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | (14) | 4
Purchases and issuances | 238 | 120
Sales and settlements | (31) | (38)
Transfer into Level 3 | 0 | 29
Transfer out of Level 3 | 0 | 0
Financial assets, Ending Balance | 1,238 | 828
Equity securities |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Financial assets, Beginning Balance | 165 | 174
Total realized/unrealized gains (losses) included in Net income | (5) | (6)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 7
Purchases and issuances | 9 | 12
Sales and settlements | (4) | 0
Transfer into Level 3 | 29 | 0
Transfer out of Level 3 | 0 | (14)
Financial assets, Ending Balance | 194 | 173
Assets of MIE |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Financial assets, Beginning Balance | 23 | 29
Total realized/unrealized gains (losses) included in Net income | (2) | (1)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0
Purchases and issuances | 3 | 2
Sales and settlements | 0 | 0
Transfer into Level 3 | 0 | 0
Transfer out of Level 3 | 0 | (4)
Financial assets, Ending Balance | $ 24 | $ 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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- Definition Amount of sale of 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)(2) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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