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Accumulated Other Comprehensive Income (Loss)
 9 Months Ended
Sep. 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
—

 
(219
)
 
(219
)
Reclassifications to Consolidated Statement of Income
4

 
80

 
84

Balance at September 30, 2016
$
(38
)
 
$
(480
)
 
$
(518
)