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Income Per Common Share (Tables) | 3 Months Ended
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Mar. 31, 2019
Earnings Per Share [Abstract] |
Schedule of reconciliations of the numerators and denominators used in the computations of basic and diluted earnings per common share | Reconciliations of the numerators and denominators used in the computations of basic and diluted income per common share were as follows, in millions:
| Three Months Ended March 31,
| 2019 |  | 2018
Numerator (basic and diluted): |  |  |  |  |
Net income | $ | 116 |  |  | $ | 149 |
Less: Allocation to unvested restricted stock awards | 1 |  |  | 1 |
Net income available to common shareholders | $ | 115 |  |  | $ | 148 |
Denominator: |  |  |  |  |
Basic common shares (based upon weighted average) | 293 |  |  | 310 |
Add: Stock option dilution | 1 |  |  | 3 |
Diluted common shares | 294 |  |  | 313 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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