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(Loss) Income Per Common Share - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 29, 2021 | Jun. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Feb. 10, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |
Amount authorized for repurchase |  |  |  |  |  |  | $ 2,000
Payment for common stock shares repurchased |  | $ 350 | $ 350 |  | $ 350 |  |
Stock repurchased during period (in shares) |  | 5,100,000 |  |  | 12,200,000 |  |
Payments for repurchase of common stock |  |  |  |  | $ 750 | $ 602 |
Remaining authorized repurchase amount |  | $ 1,400 | $ 1,400 |  | $ 1,400 |  |
Dividends |  |  |  |  |  |  |
Cash dividends per common share paid (in dollars per share) |  |  | $ 0.235 | $ 0.135 | $ 0.375 | $ 0.270 |
Cash dividends per common share declared (in dollars per share) |  |  | $ 0.235 | $ 0.135 | $ 0.235 | $ 0.270 |
Subsequent Event |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |
Stock repurchased during period (in shares) | 900,000 |  |  |  |  |  |
Stock options |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |
Antidilutive effect on computation of diluted earnings per common share (in shares) |  |  | 2,800,000 | 762,000 | 260,000 | 672,000 |
Long-term stock awards |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |
Antidilutive effect on computation of diluted earnings per common share (in shares) |  |  | 464,000 |  | 1,000 |  |
Restricted stock units |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |
Stock repurchased and retired during period to offset dilutive impact of awards granted (in shares) |  |  |  |  | 700,000 |  |

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