Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2014

Commitments and Contingencies Disclosure [Abstract]

Summary of estimated coal take-or-pay commitments

The following table summarizes our estimated coal take-or-pay commitments (dollars in millions):

	Years Ended December 31,
	2015		2016		2017		2018		2019		Thereafter
Coal take-or-pay commitments (a)	$	151	$	171	$	195	$	190	$	194	$	2,469

(a) Total take-or-pay commitments are approximately $3.4 billion.  The total net present value of these commitments is approximately $2.2 billion.

Summary of actual take-or-pay commitments

The following table summarizes actual payments under the coal contracts which include take-or-pay provisions for each of the last three years (dollars in millions):

	Year Ended December 31,
	2014		2013		2012
Total payments	$	237	$	188	$	196