Changes to Debt (Detail) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2016 |
Mar. 31, 2015 |
|
| Debt Instrument [Line Items] | ||
| Balance at January 1, 2016 | $ 6,489 | |
| Balance at January 1, 2016 | 103,240 | |
| Balance at January 1, 2016 | 109,729 | |
| Repayments of long-term borrowings and capital leases obligations | (376) | $ (5,576) |
| Decrease in short-term obligations, excluding current maturities | (40) | $ 482 |
| Other | 567 | |
| Balance at March 31, 2016 | 6,265 | |
| Balance at March 31, 2016 | 103,615 | |
| Balance at March 31, 2016 | 109,880 | |
| Debt Maturing Within One Year | ||
| Debt Instrument [Line Items] | ||
| Balance at January 1, 2016 | 6,489 | |
| Repayments of long-term borrowings and capital leases obligations | (376) | |
| Decrease in short-term obligations, excluding current maturities | (40) | |
| Reclassifications of long-term debt | 81 | |
| Other | 111 | |
| Balance at March 31, 2016 | 6,265 | |
| Long-term Debt | ||
| Debt Instrument [Line Items] | ||
| Balance at January 1, 2016 | 103,240 | |
| Reclassifications of long-term debt | 81 | |
| Other | 456 | |
| Balance at March 31, 2016 | $ 103,615 | |