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Shareholders' Equity - Comprehensive Capital Plan (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) |  |  |  |  | $ 0.71 | $ 0.565 | $ 0.38
2019 Capital Plan [Member] |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |
Authorized amount of share repurchases | $ 1,000,000,000.0 |  |  |  | $ 1,000,000,000.0 |  |
Common shares repurchased, value |  |  |  |  | 489,000,000 |  |
Cash dividends declared per common share (in dollars per share) | $ 0.185 | $ 0.185 |  |  |  |  |
2018 Capital Plan [Member] |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |
Common shares repurchased, value |  |  |  |  | $ 379,000,000 |  |
Cash dividends declared per common share (in dollars per share) |  |  | $ 0.17 | $ 0.17 |  |  |

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