v3.3.0.814

Stock-Based Compensation (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule Of Stock-Based Compensation Expense | Pretax stock-based compensation costs, the tax benefit associated with stock-based compensation expense, and stock-based compensation costs capitalized are included in the following table.
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
(in millions) | 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
Restricted stock unit awards | $ | 9 |  |  | $ | 8 |  |  | $ | 29 |  |  | $ | 30 |
Performance awards | 5 |  |  | 4 |  |  | 18 |  |  | 14 |
Pretax stock-based compensation cost | $ | 14 |  |  | $ | 12 |  |  | $ | 47 |  |  | $ | 44 |
Tax benefit associated with stock-based compensation expense | $ | 6 |  |  | $ | 5 |  |  | $ | 18 |  |  | $ | 17 |
Stock-based compensation costs capitalized | 1 |  |  | 1 |  |  | 3 |  |  | 3 |

X
- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration