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Regulatory Capital and Other Regulatory Matters (Common Share Repurchases) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 14, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |
Treasury stock, common, amount |  | $ 0 | $ 229 | $ 0 | $ 229 | $ 104 | $ 299 | $ 300 | $ 211 |
Treasury stock, common, shares |  | 53,000 | 7,775,000 | 53,000 | 7,775,000 | 3,838,000 | 9,554,000 | 9,287,000 | 8,113,000 |
Common stock, shares outstanding |  | 373,837,123 | 392,775,000 | 373,837,123 | 392,775,000 | 373,155,000 | 374,331,998 | 383,523,000 | 399,761,000 | 404,900,000
Dividends declared, amount per common share |  | $ 0.19 | $ 0.17 | $ 0.19 | $ 0.17 | $ 0.19 | $ 0.17 | $ 0.17 | $ 0.17 |
Cash dividends declared per common share |  | $ 0.19 | $ 0.17 | $ 0.38 | $ 0.34 |  |  |  |  |
Stock repurchase program, authorized amount |  |  | $ 1,250 |  | $ 1,250 |  |  |  |  |
Common stock | Subsequent event |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date Declared | Jul. 14, 2020 |  |  |  |  |  |  |  |  |
Cash dividends declared per common share | $ 0.19 |  |  |  |  |  |  |  |  |
Dividends Payable, Date to be Paid | Aug. 14, 2020 |  |  |  |  |  |  |  |  |
Dividends Payable, Date of Record | Jul. 31, 2020 |  |  |  |  |  |  |  |  |

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