|
Fair Value of Short Term and Long Term Debt Excluding Capital Leases (Detail) (USD $)
In Millions, unless otherwise specified |
Mar. 31, 2015
|
Dec. 31, 2014
|
|---|---|---|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Short- and long-term debt | $ 113,388 | $ 113,271 |
| Carrying Amount, Fair Value Disclosure | Excluding Capital Leases | ||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Short- and long-term debt | 112,738 | 112,755 |
| Estimate of Fair Value Measurement | Excluding Capital Leases | ||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Short- and long-term debt | $ 128,347 | $ 126,549 |