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Earnings Per Common Share (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Numerator (basic and diluted): |  |  |  |
Income from continuing operations | $ 150 | $ 109 | $ 259 | $ 170
Less: Allocation to unvested restricted stock awards | 2 | 1 | 3 | 2
Income from continuing operations attributable to common shareholders | 148 | 108 | 256 | 168
Loss from discontinued operations, net | 0 | (4) | 0 | (1)
Less: Allocation to unvested restricted stock awards | 0 | 0 | 0 | 0
Loss from discontinued operations attributable to common shareholders | 0 | (4) | 0 | (1)
Net income available to common shareholders | $ 148 | $ 104 | $ 256 | $ 167
Denominator: |  |  |  |
Basic common shares (based upon weighted average) (in shares) | 328 | 340 | 329 | 342
Add: Stock option dilution (in shares) | 3 | 4 | 4 | 4
Diluted common shares (in shares) | 331 | 344 | 333 | 346

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- Definition Amount after tax of income (loss) from continuing operations attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.13) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4613673-111683 + Details
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