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Capital Stock (Narrative) (Details) - USD ($) $ / shares in Units, $ in Billions | Feb. 25, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Class of Stock [Line Items] |  |  |
Preferred stock, shares authorized (in shares) |  | 30,000,000 | 30,000,000
Subsequent Event |  |  |
Class of Stock [Line Items] |  |  |
Common stock, dividends, per share, declared | $ 0.20 |  |
Stock repurchase program, authorized amount | $ 1.5 |  |

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