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Fair Value Measurements (Details 2) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Financial assets, Beginning Balance | $ 1,636 | $ 1,355
Impact of accounting change |  | 0
Total realized/unrealized gains (losses) included in Net income | (20) | (3)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 20 | 7
Purchases and issuances | 102 | 59
Sales and settlements | (23) | (61)
Transfer into Level 3 | 72 | 62
Transfer out of Level 3 | (16) | (86)
Financial assets, Ending Balance | 1,771 | 1,333
US Treasury and Government [Member] |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Financial assets, Beginning Balance | 15 | 15
Impact of accounting change |  | 0
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 | 15 | 15
States, municipalities and political subdivisions [Member] |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Financial assets, Beginning Balance | 89 | 100
Impact of accounting change |  | 0
Total realized/unrealized gains (losses) included in Net income | 0 | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 3 | 0
Purchases and issuances | 0 | 0
Sales and settlements | 0 | 0
Transfer into Level 3 | 0 | 0
Transfer out of Level 3 | 0 | (39)
Financial assets, Ending Balance | 92 | 61
Residential Mortgage Backed Securities [Member] |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Financial assets, Beginning Balance | 224 | 300
Impact of accounting change |  | 0
Total realized/unrealized gains (losses) included in Net income | 1 | (1)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 3
Purchases and issuances | 0 | 0
Sales and settlements | (7) | (7)
Transfer into Level 3 | 11 | 41
Transfer out of Level 3 | (16) | (30)
Financial assets, Ending Balance | 213 | 306
Commercial Mortgage Backed Securities [Member] |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Financial assets, Beginning Balance | 39 | 44
Impact of accounting change |  | 0
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 | (1) | 0
Transfer into Level 3 | 0 | 0
Transfer out of Level 3 | 0 | 0
Financial assets, Ending Balance | 38 | 44
Asset-backed Securities [Member] |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Financial assets, Beginning Balance | 470 | 226
Impact of accounting change |  | 0
Total realized/unrealized gains (losses) included in Net income | 0 | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | (6) | 0
Purchases and issuances | 4 | 5
Sales and settlements | (8) | (41)
Transfer into Level 3 | 41 | 21
Transfer out of Level 3 | 0 | 0
Financial assets, Ending Balance | 501 | 211
All other corporate [Member] |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Financial assets, Beginning Balance | 633 | 546
Impact of accounting change |  | 0
Total realized/unrealized gains (losses) included in Net income | (2) | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 15 | 6
Purchases and issuances | 86 | 44
Sales and settlements | (7) | (13)
Transfer into Level 3 | 5 | 0
Transfer out of Level 3 | 0 | 0
Financial assets, Ending Balance | 730 | 583
Fixed maturities [Member] |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Financial assets, Beginning Balance | 1,470 | 1,231
Impact of accounting change |  | 0
Total realized/unrealized gains (losses) included in Net income | (1) | (1)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 12 | 9
Purchases and issuances | 90 | 49
Sales and settlements | (23) | (61)
Transfer into Level 3 | 57 | 62
Transfer out of Level 3 | (16) | (69)
Financial assets, Ending Balance | 1,589 | 1,220
Equity securities [Member] |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Financial assets, Beginning Balance | 140 | 93
Impact of accounting change |  | 0
Total realized/unrealized gains (losses) included in Net income | (17) | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 8 | (2)
Purchases and issuances | 12 | 10
Sales and settlements | 0 | 0
Transfer into Level 3 | 15 | 0
Transfer out of Level 3 | 0 | (17)
Financial assets, Ending Balance | 158 | 84
Assets of Managed Investment Entities [Member] |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Financial assets, Beginning Balance | 26 | 31
Impact of accounting change |  | 0
Total realized/unrealized gains (losses) included in Net income | (2) | (2)
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 | $ 24 | $ 29

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