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Accumulated Other Comprehensive Income (Loss)
 9 Months Ended
Sep. 30, 2014
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, 2013
$
(54
)
 
$
(231
)
 
$
(285
)
Reclassifications to Consolidated Statement of Income
4

 
14

 
18

Balance at September 30, 2014
$
(50
)
 
$
(217
)
 
$
(267
)