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Earnings Per Share - Reconciliation of Information Used to Compute Basic and Diluted EPS (Details) - USD ($) shares in Millions, $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 15, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Net income |  | $ 215 | $ 187 |
Less: preferred stock dividends declared |  | (1) | (1) |
Net income available to the Company's common shareholders - basic |  | 214 | 186 |
Add: Interest expense related to convertible notes |  | 0 | 4 |
Net income available to the Company's common shareholders - diluted |  | $ 214 | $ 190 |
Average shares outstanding - basic (in shares) |  | 435 | 471 |
Effect of dilutive securities: |  |  |  |
Stock options (in shares) |  | 1 | 0 |
Stock and performance awards (in shares) |  | 4 | 4 |
Convertible notes (in shares) |  | 0 | 14 |
Average shares outstanding - diluted (in shares) |  | 440 | 489 |
Common stock outstanding (in shares) |  | 436 | 453 |
Incremental common shares attributable to dilutive effect of accelerated share repurchase agreements (in shares) |  |  |  | 55
Convertible notes |  |  |  |
Effect of dilutive securities: |  |  |  |
Number of shares of common stock previously attributable to the convertible notes (in shares) | 15 |  |  |

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