Amounts in Accumulated Other Comprehensive Income | Pension Plans | Postretirement Health Care Plans | |||||||||||
(millions) | 2013 | 2012 | 2013 | 2012 | |||||||||
Net actuarial loss | $ | 792 | $ | 947 | $ | 49 | $ | 58 | |||||
Prior service credits | (80 | ) | (91 | ) | (62 | ) | (34 | ) | |||||
Amounts in accumulated other comprehensive income | $ | 712 | $ | 856 | $ | (13 | ) | $ | 24 |