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AOCI Rollforward (Details 2) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Beginning balance |  | $ 269 | $ (179) | $ (291) | $ 229 |  |
Cumulative effect of change in accounting policies |  |  |  |  |  | $ 5 | $ 0
OCI before reclassifications |  | 60 | (62) | 625 | (461) |  |
Amounts reclassified from AOCI |  | 8 | (3) | 3 | (11) |  |
Total other comprehensive income (loss), net of tax |  | 68 | (65) | 628 | (472) |  |
Ending balance |  | 337 | (244) | 337 | (244) |  |
Accumulated Other Comprehensive Income (Loss) Available For Sale Securities Impairment Other than Credit |  | (1) | (1) | (1) | (1) |  |
Net unrealized gains (losses) on securities [Member] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 590 | 93 | 20 | 486 |  |
OCI before reclassifications |  | 82 | (59) | 656 | (443) |  |
Amounts reclassified from AOCI |  | 8 | (3) | 4 | (11) |  |
Total other comprehensive income (loss), net of tax |  | 90 | (62) | 660 | (454) |  |
Ending balance | [1] | 680 | 31 | 680 | 31 |  |
Net unrealized gains (losses) on derivatives [Member] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 7 | 8 | 8 | 8 |  |
OCI before reclassifications |  | 0 | 0 | 0 | 0 |  |
Amounts reclassified from AOCI |  | 0 | 0 | (1) | 0 |  |
Total other comprehensive income (loss), net of tax |  | 0 | 0 | (1) | 0 |  |
Ending balance |  | 7 | 8 | 7 | 8 |  |
Defined benefit plans [Member] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Beginning balance |  | (120) | (97) | (120) | (97) |  |
OCI before reclassifications |  | 0 | 0 | 0 | 0 |  |
Amounts reclassified from AOCI |  | 0 | 0 | 0 | 0 |  |
Total other comprehensive income (loss), net of tax |  | 0 | 0 | 0 | 0 |  |
Ending balance |  | (120) | (97) | (120) | (97) |  |
Foreign currency translation [Member] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Beginning balance |  | (207) | (182) | (198) | (167) |  |
OCI before reclassifications |  | (22) | (3) | (31) | (18) |  |
Amounts reclassified from AOCI |  | 0 | 0 | 0 | 0 |  |
Total other comprehensive income (loss), net of tax |  | (22) | (3) | (31) | (18) |  |
Ending balance |  | (229) | (185) | (229) | (185) |  |
Other [Member] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Beginning balance |  | (1) | (1) | (1) | (1) |  |
OCI before reclassifications |  | 0 | 0 | 0 | 0 |  |
Amounts reclassified from AOCI |  | 0 | 0 | 0 | 0 |  |
Total other comprehensive income (loss), net of tax |  | 0 | 0 | 0 | 0 |  |
Ending balance |  | $ (1) | $ (1) | $ (1) | $ (1) |  |
Cumulative effect of adoption of equity securities guidance |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Cumulative effect of change in accounting policies |  |  |  |  |  |  | 1
Cumulative effect of adoption of equity securities guidance | Net unrealized gains (losses) on securities [Member] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Cumulative effect of change in accounting policies |  |  |  |  |  |  | $ 1
[1] | Includes $1 million of noncredit related impairments on securities and net unrealized gains (losses) on previously impaired securities as of both September 30, 2019 and September 30, 2018.

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