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Accumulated Other Comprehensive Income (Loss)
 6 Months Ended
Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated Other Comprehensive Income (Loss)
10. Accumulated Other Comprehensive Income (Loss)

The following summarizes the after-tax changes in the balances of accumulated other comprehensive income (loss):
millions
Interest-rate
Derivatives
Previously
Subject to Hedge
Accounting
 
Pension and Other Postretirement
Plans
 
Total
Balance at December 31, 2014
$
(48
)
 
$
(469
)
 
$
(517
)
Reclassifications to Consolidated Statement of Income
3

 
18

 
21

Balance at June 30, 2015
$
(45
)
 
$
(451
)
 
$
(496
)