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Fair Value Measurements - Fair Value Recurring Basis, Unobservable Input (Details) - Significant Unobservable Inputs (Level 3) - Fair Value, Measurements, Recurring - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Assets |  |
Beginning balance | $ 2,202 | $ 1,771
Total realized/unrealized gains (losses), Included in net income | 8 | (30)
Total realized/unrealized gains (losses), Included in OCI | 43 | 22
Purchases | 833 | 853
Settlements | (463) | (335)
Sales | (254) | (147)
Transfers into Level 3 | 98 | 293
Transfers out of Level 3 | (437) | (225)
Ending balance | 2,030 | 2,202
Freestanding Derivatives, net |  |
Beginning balance | 10 | 14
Total realized/unrealized gains (losses), Included in net income | (13) | (12)
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 5 | 8
Settlements | 0 | 0
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | 2 | 10
Liabilities |  |
Beginning balance | (25) | 0
Total realized/unrealized gains (losses), Included in Net Income | (4) | (2)
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 0 | (23)
Settlements | 0 | 0
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | (29) | (25)
Contingent Consideration |  |
Liabilities |  |
Beginning balance | (25) | 0
Total realized/unrealized gains (losses), Included in Net Income | (4) | (2)
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 0 | (23)
Settlements | 0 | 0
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | (29) | (25)
Equity |  |
Freestanding Derivatives, net |  |
Beginning balance | 0 | 0
Total realized/unrealized gains (losses), Included in net income | (4) | (8)
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 5 | 8
Settlements | 0 | 0
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | 1 | 0
Interest rate derivatives |  |
Freestanding Derivatives, net |  |
Beginning balance | 9 | 7
Total realized/unrealized gains (losses), Included in net income | (8) | 2
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 0 | 0
Settlements | 0 | 0
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | 1 | 9
Other contracts |  |
Freestanding Derivatives, net |  |
Beginning balance | 1 | 7
Total realized/unrealized gains (losses), Included in net income | (1) | (6)
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 0 | 0
Settlements | 0 | 0
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | 0 | 1
Fixed Maturities, FVO | Total fixed maturities |  |
Assets |  |
Beginning balance | 11 | 14
Total realized/unrealized gains (losses), Included in net income | 0 | (1)
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 4 | 14
Settlements | (2) | (4)
Sales | (13) | (3)
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | (9)
Ending balance | 0 | 11
Securities available-for-sale and other | Equity securities |  |
Assets |  |
Beginning balance | 55 | 55
Total realized/unrealized gains (losses), Included in net income | 0 | (1)
Total realized/unrealized gains (losses), Included in OCI | (3) | 4
Purchases | 24 | 2
Settlements | 0 | 0
Sales | 0 | (5)
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | 76 | 55
Securities available-for-sale and other | Total fixed maturities |  |
Assets |  |
Beginning balance | 2,126 | 1,688
Total realized/unrealized gains (losses), Included in net income | 21 | (16)
Total realized/unrealized gains (losses), Included in OCI | 46 | 18
Purchases | 800 | 829
Settlements | (461) | (331)
Sales | (241) | (139)
Transfers into Level 3 | 98 | 293
Transfers out of Level 3 | (437) | (216)
Ending balance | 1,952 | 2,126
Securities available-for-sale and other | ABS | Total fixed maturities |  |
Assets |  |
Beginning balance | 45 | 32
Total realized/unrealized gains (losses), Included in net income | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 0 | (1)
Purchases | 56 | 33
Settlements | (6) | (6)
Sales | (6) | 0
Transfers into Level 3 | 27 | 16
Transfers out of Level 3 | (97) | (29)
Ending balance | 19 | 45
Securities available-for-sale and other | CDOs | Total fixed maturities |  |
Assets |  |
Beginning balance | 154 | 211
Total realized/unrealized gains (losses), Included in net income | 18 | 0
Total realized/unrealized gains (losses), Included in OCI | (13) | 9
Purchases | 214 | 36
Settlements | (101) | (102)
Sales | (24) | 0
Transfers into Level 3 | 0 |
Transfers out of Level 3 | (153) | 0
Ending balance | 95 | 154
Securities available-for-sale and other | CMBS | Total fixed maturities |  |
Assets |  |
Beginning balance | 59 | 88
Total realized/unrealized gains (losses), Included in net income | (2) | (4)
Total realized/unrealized gains (losses), Included in OCI | 0 | (1)
Purchases | 76 | 45
Settlements | (9) | (15)
Sales | (10) | (1)
Transfers into Level 3 | 0 | 1
Transfers out of Level 3 | (45) | (54)
Ending balance | 69 | 59
Securities available-for-sale and other | Corporate | Total fixed maturities |  |
Assets |  |
Beginning balance | 514 | 320
Total realized/unrealized gains (losses), Included in net income | 1 | (12)
Total realized/unrealized gains (losses), Included in OCI | 19 | 1
Purchases | 232 | 197
Settlements | (76) | (34)
Sales | (157) | (102)
Transfers into Level 3 | 71 | 265
Transfers out of Level 3 | (84) | (121)
Ending balance | 520 | 514
Securities available-for-sale and other | Foreign government | Total fixed maturities |  |
Assets |  |
Beginning balance | 47 | 43
Total realized/unrealized gains (losses), Included in net income | 0 | 1
Total realized/unrealized gains (losses), Included in OCI | 3 | 2
Purchases | 12 | 16
Settlements | (1) | 0
Sales | (2) | (15)
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | (57) | 0
Ending balance | 2 | 47
Securities available-for-sale and other | Municipal | Total fixed maturities |  |
Assets |  |
Beginning balance | 46 | 0
Total realized/unrealized gains (losses), Included in net income | 4 | 0
Total realized/unrealized gains (losses), Included in OCI | 1 | (1)
Purchases | 1 | 39
Settlements | 0 | 0
Sales | (35) | 0
Transfers into Level 3 | 0 | 8
Transfers out of Level 3 | 0 | 0
Ending balance | 17 | 46
Securities available-for-sale and other | RMBS | Total fixed maturities |  |
Assets |  |
Beginning balance | 1,261 | 994
Total realized/unrealized gains (losses), Included in net income | 0 | (1)
Total realized/unrealized gains (losses), Included in OCI | 36 | 9
Purchases | 209 | 463
Settlements | (268) | (174)
Sales | (7) | (21)
Transfers into Level 3 | 0 | 3
Transfers out of Level 3 | (1) | (12)
Ending balance | $ 1,230 | $ 1,261

X
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- Definition Amount of transfers of financial instrument classified as a liability 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 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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