|
Depreciation Expense, by Segment (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2012
|
Dec. 31, 2011
|
Dec. 31, 2010
|
|
| Reconciliation of Depreciation by Segment [Line Items] | |||
| Depreciation expense | $ 1,653 | $ 1,034 | $ 552 |
|
North America
|
|||
| Reconciliation of Depreciation by Segment [Line Items] | |||
| Depreciation expense | 1,229 | 795 | 455 |
|
International
|
|||
| Reconciliation of Depreciation by Segment [Line Items] | |||
| Depreciation expense | $ 424 | $ 239 | $ 97 |