|
Long-Term Debt - Capital Leases - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
|
| Debt Disclosure [Abstract] | |||
| Repayment of capital lease obligations | $ 20 | $ 16 | $ 14 |
| Capital lease obligations incurred | 32 | 63 | 28 |
| Termination of capital lease obligations | $ 1 | $ 14 | |