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Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2019
Cash dividends declared |  |  |
Common stock, dividend per share (in dollars per share) | $ 0.43 | $ 0.43 |
Cumulative Effect, Period of Adoption, Adjustment |  |  |
Cash dividends declared |  |  |
Impact of new accounting guidance, net of tax |  |  | $ 1,170
Impact of new accounting guidance, tax |  |  | $ 288
Series B Preferred Stock |  |  |
Cash dividends declared |  |  |
Preferred stock, dividend per share (in dollars per share) | 12.43 | 14.09 |
Series C Preferred Stock |  |  |
Cash dividends declared |  |  |
Preferred stock, dividend per share (in dollars per share) | $ 10.30 | $ 24.50 |

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