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Shareholders' Equity - Comprehensive Capital Plan (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Jan. 31, 2021
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Cash dividends declared on Common Shares (in usd per share) | $ 0.185 | $ 0.185 |
2021 Capital Plan |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Stock repurchase program, amount authorized |  |  | $ 900
Common stock repurchased during period | $ 166 |  |
Cash dividends declared on Common Shares (in usd per share) | $ 0.185 |  |
Open Market Share Repurchases |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Common stock repurchased during period | $ 135 |  |
Employee Equity Compensation Programs |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Common stock repurchased during period | $ 31 |  |

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