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Share-Based Compensation - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) vesting_period shares | Dec. 31, 2018 vesting_period shares | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock, shares authorized (in shares) | 3,000,000,000 | 2,000,000,000 |
Restricted stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Aggregate intrinsic value, vested | $ | $ 15 |  |
Unrecognized compensation expense | $ | $ 19 |  |
Unrecognized compensation expense, weighted average period of recognition | 1 year 11 months 1 day |  |
Share-based payment arrangement, option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation expense, weighted average period of recognition | 1 year 2 months 23 days |  |
Unrecognized compensation, stock options | $ | $ 5 |  |
Share-based payment arrangement, option | Management |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years | 3 years | 3 years
Share-based payment arrangement, option | Management | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options expiration | 7 years |  |
Share-based payment arrangement, option | Management | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options expiration | 10 years |  |
Performance shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Performance shares | 2018 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Number of vesting periods | vesting_period | 3 | 3 |
Performance shares | 2018 | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Payout percentage | 0.00% |  |
Performance shares | 2018 | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Payout percentage | 200.00% |  |
Performance shares | Management | 2017 and 2016 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance share units maximum payout percentage | 200.00% |  |
PSU awards capped payout percentage | 100.00% |  |
TSR, terms of award | less than zero |  |
Performance shares | Management | 2017 and 2016 | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
TSR component, performance metrics | 0.00% |  |
Optional component, performance metrics | 0.00% |  |
Performance shares | Management | 2017 and 2016 | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
TSR component, performance metrics | 100.00% |  |
Optional component, performance metrics | 100.00% |  |
2014 long term incentive plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Reduction due to issuance of stock option or SAR (in shares) | 1.0 |  |
Reduction due to award other than stock option or SAR (in shares) | 2.12 |  |
Vesting period | 10 years |  |
Common stock, reserved for future issuance (in shares) | 29,865,514 |  |
2014 long term incentive plan | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock, shares authorized (in shares) | 71,600,000 |  |

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