|
Leasing Arrangements - Additional Information (Detail) (USD $)
In Billions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2013
Y
|
Dec. 31, 2012
|
Dec. 31, 2011
|
|
| Operating Leased Assets [Line Items] | |||
| Number of years remaining on current lease agreements high end of range | 37 | ||
| Accumulated deferred taxes arising from leveraged leases | $ 1.0 | $ 1.2 | |
| Rent expense under operating leases | $ 2.6 | $ 2.5 | $ 2.5 |