The following table provides information about the Company's investment securities with gross unrealized losses and the length of time that individual securities have been in a continuous unrealized loss position as of December 31:
| 2013 | 2012 | |||||||||||||||||||||||||
| Less than 12 months | 12 months or more | Less than 12 months | 12 months or more | |||||||||||||||||||||||
| Gross | Gross | Gross | Gross | |||||||||||||||||||||||
| Estimated | Unrealized | Estimated | Unrealized | Estimated | Unrealized | Estimated | Unrealized | |||||||||||||||||||
| Description of Securities (Millions) | Fair Value | Losses | Fair Value | Losses | Fair Value | Losses | Fair Value | Losses | ||||||||||||||||||
| State and municipal obligations | $ | 1,320 | $ | (63) | $ | 106 | $ | (16) | $ | 100 | $ | (1) | $ | 73 | $ | (4) | ||||||||||
| Foreign government bonds and obligations | 208 | (1) | ― | ― | ― | ― | ― | ― | ||||||||||||||||||
| U.S. Government treasury obligations | 166 | (1) | ― | ― | ― | ― | ― | ― | ||||||||||||||||||
| Mortgage-backed securities | 35 | (1) | ― | ― | ― | ― | ― | ― | ||||||||||||||||||
| Other | 30 | (1) | 17 | (1) | ― | ― | ― | ― | ||||||||||||||||||
| Total | $ | 1,759 | $ | (67) | $ | 123 | $ | (17) | $ | 100 | $ | (1) | $ | 73 | $ | (4) | ||||||||||