|
Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | |
|---|---|---|
|
Mar. 31, 2015
apportionment_issue
|
Mar. 31, 2014
|
|
| Income Taxes [Line Items] | ||
| Effective income tax rate | 32.40% | 25.50% |
| Unrecognized tax benefits | $ 10 | |
| Unrecognized tax benefits that, if recognized, would impact the effective tax rate | 7 | |
| State apportionment issues expected to be resolve during the next 12 months | 2 | |
| Net cash payments (receipts) for income tax (refunds) | 58 | 25 |
| US Federal Tax Issue | ||
| Income Taxes [Line Items] | ||
| Change in unrecognized tax benefits, amount of unrecorded benefit | 21 | |
| State Apportionment Issues | ||
| Income Taxes [Line Items] | ||
| Change in unrecognized tax benefits, amount of unrecorded benefit | $ 4 | |