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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Feb. 01, 2021 | Jan. 07, 2021 | Feb. 28, 2019
Stockholders Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  | 1,000,000,000.0 | 1,000,000,000.0 |  |  |  | 1,000,000,000.0 |  |  |  |  |  |  |  | 1,000,000,000.0 |  |  |
Common stock, par value (in dollars per share) |  | $ 0.10 | $ 0.10 |  |  |  | $ 0.10 |  |  |  |  |  |  |  | $ 0.10 |  |  |
Preferred Stock, Shares Authorized |  |  | 4,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  | $ 1.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of increase to quarterly dividend |  |  |  |  | 22.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividends, rate per share | $ 0.26 |  | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.09 | $ 0.09 | $ 0.09 | $ 0.09 | $ 0.08 | $ 0.08 | $ 0.08 | $ 0.08 | $ 0.06 |  |  |  |
Dividend payable date | Oct. 01, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend payable date of record | Aug. 14, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  | 382,000,000 | 382,000,000 |  |  |  | 382,000,000 |  |  |  |  |  |  |  | 382,000,000 |  |  |
Common stock, $0.10 par value. Authorized 1.0 billion shares; issued 382 million and 382 million shares in 2020 and 2019, respectively |  | $ 38 | $ 38 |  |  |  | $ 38 |  |  |  |  |  |  |  | $ 38 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend payable amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 128 |  |
Dividends payable, per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.19 |  |
Dividends payable, year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2021 |  |
Common stock converted to right to receive share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.5165 |
Common stock, shares issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 290,000,000 |
Common stock, $0.10 par value. Authorized 1.0 billion shares; issued 382 million and 382 million shares in 2020 and 2019, respectively |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,400 |
Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  | $ 4,000 |  |  |  |  |  |  | $ 5,000
5.0 Billion 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 |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  | $ 1,000 |  |  |
Share-repurchase program expiration date |  | Dec. 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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