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Accumulated Other Comprehensive Income (Loss)
 6 Months Ended
Jun. 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):
 
Interest-rate
 
 
 
 
 
Derivatives
 
Pension and
 
 
 
Previously
 
Other
 
 
 
Subject to Hedge
 
Postretirement
 
 
millions
Accounting
 
Plans
 
Total
Balance at December 31, 2012
$
(61
)
 
$
(579
)
 
$
(640
)
Reclassifications from accumulated other
   comprehensive income (loss)
3

 
38

 
41

Balance at June 30, 2013
$
(58
)
 
$
(541
)
 
$
(599
)