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Income Per Common Share (Tables) | 9 Months Ended
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Sep. 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 September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Numerator (basic and diluted): |  |  |  |  |  |  |  |  |  |  |
Net income | $ | 180 |  |  | $ | 152 |  |  | $ | 540 |  |  | $ | 453 |
Less: Allocation to unvested restricted stock awards | 1 |  |  | 1 |  |  | 5 |  |  | 4 |
Net income available to common shareholders | $ | 179 |  |  | $ | 151 |  |  | $ | 535 |  |  | $ | 449 |
Denominator: |  |  |  |  |  |  |  |  |  |  |
Basic common shares (based upon weighted average) | 304 |  |  | 313 |  |  | 307 |  |  | 315 |
Add: Stock option dilution | 2 |  |  | 3 |  |  | 2 |  |  | 4 |
Diluted common shares | 306 |  |  | 316 |  |  | 309 |  |  | 319 |

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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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