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Shareholders' Equity AOCI Rollforward (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance |  | $ (291) |  | $ 229 |  | $ 200
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  | 1
OCI before reclassifications |  | 540 |  | (525) |  | 54
Amounts reclassified from AOCI |  | 13 |  | 6 |  | (25)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  | 553 |  | (519) |  | 29
Ending balance |  | 262 |  | (291) |  | 229
Net unrealized securities gains [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance |  | 20 | [1] | 486 | [1] | 479
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  | 1
OCI before reclassifications |  | 551 |  | (458) |  | 43
Amounts reclassified from AOCI |  | 5 |  | (7) |  | (36)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  | 556 |  | (465) |  | 7
Ending balance | [1] | 576 |  | 20 |  | 486
Noncredit related impairments on AFS securities |  | 1 |  | 1 |  | 1
Net unrealized derivatives losses [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance |  | 8 |  | 8 |  | 5
Amounts reclassified from AOCI |  | (2) |  | 0 |  | 3
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  | (2) |  | 0 |  | 3
Ending balance |  | 6 |  | 8 |  | 8
Defined benefit plans [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance |  | (120) |  | (97) |  | (125)
OCI before reclassifications |  | (28) |  | (36) |  | 20
Amounts reclassified from AOCI |  | 10 |  | 13 |  | 8
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  | (18) |  | (23) |  | 28
Ending balance |  | (138) |  | (120) |  | (97)
Foreign currency translation [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance |  | (198) |  | (167) |  | (159)
OCI before reclassifications |  | 17 |  | (31) |  | (8)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  | 17 |  | (31) |  | (8)
Ending balance |  | (181) |  | (198) |  | (167)
Accumulated Net Unrealized From Other Investment Gain Loss [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance |  | (1) |  | (1) |  | 0
OCI before reclassifications |  | 0 |  | 0 |  | (1)
Amounts reclassified from AOCI |  | 0 |  | 0 |  | 0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  | 0 |  | 0 |  | (1)
Ending balance |  | $ (1) |  | $ (1) |  | $ (1)
[1] | Includes $1 million, $1 million and $1 million of noncredit related impairments on securities and net unrealized gains (losses) on previously impaired securities as of December 31, 2019, 2018 and 2017, respectively.

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