| Short-Term Borrowings and Current Portion of Long-Term Debt | |||||||||
| Effective | Carrying Value | ||||||||
| (Millions) | Interest Rate | 2013 | 2012 | ||||||
| Current portion of long-term debt | 3.05 | % | $ | 1,586 | $ | 986 | |||
| U.S. dollar commercial paper | ― | % | ― | ― | |||||
| Other borrowings | 5.35 | % | 97 | 99 | |||||
| Total short-term borrowings and current portion of long-term debt | $ | 1,683 | $ | 1,085 | |||||