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Stock Compensation Plans - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Potential shares of common stock issued under current stock compensation plan (in shares) | 18,000,000 |  |
Stock compensation plan, expiration date | Apr. 09, 2027 |  |
Contractual term | 7 years 6 months |  |
Aggregate intrinsic value of options exercised | $ 0 | $ 3 | $ 9
Unearned compensation cost related to unvested portion | $ 22 |  |
Options |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Shares that count towards shares authorized limit per share granted (in shares) | 1 |  |
Vesting period | 4 years |  |
Stock options conversion basis (in shares) | 1 |  |
Contractual term | 10 years |  |
Cancellation, days after termination of employment | 90 days |  |
Options | Year 1 |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Vesting percentage | 25.00% |  |
Options | Year 2 |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Vesting percentage | 25.00% |  |
Options | Year 3 |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Vesting percentage | 25.00% |  |
Options | Year 4 |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Vesting percentage | 25.00% |  |
Awards, Excluding Options |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Shares that count towards shares authorized limit per share granted (in shares) | 2 |  |
Performance Share Units |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Award performance period | 3 years |  |
Performance Share Units | Minimum |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Percentage of units earned to units granted | 0.00% | 0.00% | 0.00%
Performance Share Units | Maximum |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Percentage of units earned to units granted | 133.00% | 200.00% | 200.00%
Restricted Stock Units |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Award performance period | 3 years |  |

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