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Income Per Common Share (Tables) | 6 Months Ended
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Jun. 30, 2018
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 June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Numerator (basic and diluted): |  |  |  |  |  |  |  |  |  |  |
Net income | $ | 211 |  |  | $ | 163 |  |  | $ | 360 |  |  | $ | 301 |
Less: Allocation to unvested restricted stock awards | 1 |  |  | 2 |  |  | 3 |  |  | 3 |
Net income available to common shareholders | $ | 210 |  |  | $ | 161 |  |  | $ | 357 |  |  | $ | 298 |
Denominator: |  |  |  |  |  |  |  |  |  |  |
Basic common shares (based upon weighted average) | 306 |  |  | 315 |  |  | 308 |  |  | 316 |
Add: Stock option dilution | 3 |  |  | 4 |  |  | 3 |  |  | 4 |
Diluted common shares | 309 |  |  | 319 |  |  | 311 |  |  | 320 |

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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://www.xbrl.org/2003/role/presentationRef -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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