| Years Ended December 31, | |||||||||||
| 2013 | 2012 | 2011 | |||||||||
| (in millions) | |||||||||||
| Assets: | |||||||||||
| Commercial mortgage loans: | |||||||||||
| Changes in instrument-specific credit risk | $ | 0 | $ | 0 | $ | 1 | |||||
| Other changes in fair value | 0 | (1) | 4 | ||||||||
| Other long-term investments: | |||||||||||
| Changes in fair value | 68 | 40 | (5) | ||||||||
| Liabilities: | |||||||||||
| Notes issued by consolidated variable interest entities: | |||||||||||
| Changes in fair value | $ | (17) | $ | 2 | $ | 0 | |||||