| Millions of Dollars | ||||||||
| Carrying Amount | ||||||||
| Cash and Cash Equivalents | Short-Term Investments | |||||||
| 2013 | 2012 | 2013 | 2012 | |||||
| Cash | $ | 636 | 829 | - | - | |||
| Time Deposits | ||||||||
| Remaining maturities from 1 to 90 days | 5,336 | 2,789 | 137 | - | ||||
| Commercial Paper | ||||||||
| Remaining maturities from 1 to 90 days | 274 | - | 135 | - | ||||
| $ | 6,246 | 3,618 | 272 | - | ||||