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Accumulated Other Comprehensive Income (Loss)
 9 Months Ended
Sep. 30, 2013
Disclosure Text Block [Abstract]  
Accumulated Other Comprehensive Income (Loss)
10. Accumulated Other Comprehensive Income (Loss)

       The following summarizes the after-tax changes in the balances of each component 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, 2012
$
(61
)
 
$
(579
)
 
$
(640
)
Reclassifications to Consolidated Statement of Income
5

 
57

 
62

Balance at September 30, 2013
$
(56
)
 
$
(522
)
 
$
(578
)