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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2020
Stockholders' Equity Note [Abstract] |
Information related to amounts reclassified from AOCI [Table Text Block] | The following table presents the changes in the balances of each component of AOCI, net of tax:
| Net Unrealized Gains (Losses) on Securities |  | Net Unrealized Gains (Losses) on Derivatives |  | Defined Benefit Plans |  | Foreign Currency Translation |  | Other |  | Total
(in millions)
Balance, January 1, 2018 | $ | 486 |  | (1) | $ | 8 |  |  | $ | (97) |  |  | $ | (167) |  |  | $ | (1) |  |  | $ | 229 |
Cumulative effect of adoption of equity securities guidance | (1) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (1) |
OCI before reclassifications | (458) |  |  | — |  |  | (36) |  |  | (31) |  |  | — |  |  | (525) |
Amounts reclassified from AOCI | (7) |  |  | — |  |  | 13 |  |  | — |  |  | — |  |  | 6 |
Total OCI | (465) |  |  | — |  |  | (23) |  |  | (31) |  |  | — |  |  | (519) |
Balance, December 31, 2018 | 20 |  | (1) | 8 |  |  | (120) |  |  | (198) |  |  | (1) |  |  | (291) |
OCI before reclassifications | 551 |  |  | — |  |  | (28) |  |  | 17 |  |  | — |  |  | 540 |
Amounts reclassified from AOCI | 5 |  |  | (2) |  |  | 10 |  |  | — |  |  | — |  |  | 13 |
Total OCI | 556 |  |  | (2) |  |  | (18) |  |  | 17 |  |  | — |  |  | 553 |
Balance, December 31, 2019 | 576 |  | (1) | 6 |  |  | (138) |  |  | (181) |  |  | (1) |  |  | 262 |
OCI before reclassifications | 416 |  |  | — |  |  | (66) |  |  | 27 |  |  | — |  |  | 377 |
Amounts reclassified from AOCI | (9) |  |  | (1) |  |  | — |  |  | — |  |  | — |  |  | (10) |
Total OCI | 407 |  |  | (1) |  |  | (66) |  |  | 27 |  |  | — |  |  | 367 |
Balance, December 31, 2020 | $ | 983 |  | (1) | $ | 5 |  |  | $ | (204) |  |  | $ | (154) |  |  | $ | (1) |  |  | $ | 629 |
(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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