Fixed Assets - Depreciation Expense Charged to Income (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
---|---|---|---|---|
Sep. 30, 2014
|
Sep. 30, 2013
|
Sep. 30, 2014
|
Sep. 30, 2013
|
|
Property Plant And Equipment [Abstract] | ||||
Depreciation expense relating to fixed assets | $ 821 | $ 788 | $ 2,414 | $ 2,324 |