Accumulated Other Comprehensive Income (Loss)

12 Months Ended

Dec. 31, 2014

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Accumulated Other Comprehensive Income (Loss)

14. 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	)
Other comprehensive income (loss), before    reclassifications	—			(256		)	(256		)
Reclassifications to Consolidated Statement of Income	6			18			24
Net other comprehensive income (loss)	6			(238		)	(232		)
Balance at December 31, 2014	$	(48	)	$	(469	)	$	(517	)