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Shareholders' Equity AOCI Rollforward (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balances |  | $ 5,729 | $ 5,588 | $ 5,995
Balances |  | 5,867 | 5,729 | 5,588
AOCI Attributable to Parent [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balances |  | 262 | (291) | 229
OCI before reclassifications |  | 377 | 540 | (525)
Amounts reclassified from AOCI |  | (10) | 13 | 6
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  | 367 | 553 | (519)
Balances |  | 629 | 262 | (291)
Net unrealized securities gains [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balances | [1] | 576 | 20 | 486
OCI before reclassifications |  | 416 | 551 | (458)
Amounts reclassified from AOCI |  | (9) | 5 | (7)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  | 407 | 556 | (465)
Balances | [1] | 983 | 576 | 20
Noncredit related impairments on AFS securities |  | 0 | 1 | 1
Net unrealized derivatives losses [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balances |  | 6 | 8 | 8
Amounts reclassified from AOCI |  | (1) | (2) |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  | (1) | (2) | 0
Balances |  | 5 | 6 | 8
Defined benefit plans [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balances |  | (138) | (120) | (97)
OCI before reclassifications |  | (66) | (28) | (36)
Amounts reclassified from AOCI |  |  | 10 | 13
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  | (66) | (18) | (23)
Balances |  | (204) | (138) | (120)
Foreign currency translation [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balances |  | (181) | (198) | (167)
OCI before reclassifications |  | 27 | 17 | (31)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  | 27 | 17 | (31)
Balances |  | (154) | (181) | (198)
Accumulated Net Unrealized From Other Investment Gain Loss [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balances |  | (1) | (1) | (1)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  | 0 | 0 | 0
Balances |  | $ (1) | $ (1) | (1)
Cumulative Effect, Period of Adoption, Adjustment [Member] | AOCI Attributable to Parent [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balances |  |  |  | (1)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Net unrealized securities gains [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balances |  |  |  | $ (1)
[1] | Includes nil, $1 million and $1 million of noncredit related impairments on securities and net unrealized gains (losses) on previously impaired securities as of December 31, 2020, 2019 and 2018, respectively.

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