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Accumulated Other Comprehensive Income (Loss)
 6 Months Ended
Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated Other Comprehensive Income (Loss)
15. 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, 2015
$
(42
)
 
$
(341
)
 
$
(383
)
Other comprehensive income (loss), before reclassifications
—

 
(120
)
 
(120
)
Reclassifications to Consolidated Statement of Income
3

 
13

 
16

Balance at June 30, 2016
$
(39
)
 
$
(448
)
 
$
(487
)