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Stockholders' Equity (Narrative) (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 04, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Dec. 31, 2020 | Oct. 01, 2020 | Dec. 31, 2019 | Feb. 28, 2019 | Jun. 30, 2018 | Mar. 31, 2018
Stockholders Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividends, rate per share |  | $ 0.11 | $ 0.11 | $ 0.09 | $ 0.09 | $ 0.09 | $ 0.08 |  |  |  |  |  |  |
Percentage of increase to quarterly dividend |  |  | 22.00% |  |  |  |  |  |  |  |  |  |  |
Dividend payable date | Oct. 01, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend payable amount, per share | $ 0.26 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend payable date of record | Aug. 14, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend payable amount |  |  |  |  |  |  |  |  |  | $ 100,000,000 |  |  |  |
Share Repurchase Programs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000,000.0 | $ 4,000,000,000.0 | $ 1,000,000,000.0
5.0 Billion Dollar Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-repurchase program expiration date |  |  |  |  |  |  |  | Dec. 31, 2019 |  |  |  |  |  |
1.0 Billion Dollar Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000.0 |  |  |
Share-repurchase program expiration date |  |  |  |  |  |  |  | Dec. 31, 2020 |  |  |  |  |  |
Stock-repurchase program, conditioned amount |  |  |  |  |  |  |  |  |  |  | $ 800,000,000 |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-repurchase program, cash proceeds required for conditioned amount |  | $ 725,000,000 |  |  |  |  |  | $ 725,000,000 |  |  |  |  |  |
Maximum [Member] | 1.0 Billion Dollar Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase program, remaining authorized repurchase amount |  |  |  |  |  |  |  |  | $ 200,000,000 |  |  |  |  |

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