Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2015

Equity [Abstract]

Accumulated Other Comprehensive Loss

The components of “Other comprehensive income” reported in the Consolidated Statements of Comprehensive Income and changes in the cumulative balances of “Accumulated other comprehensive loss” reported in the Consolidated Balance Sheets consisted of the following:

	Pensions and Other Postretirement Benefits				Other Comprehensive Loss of Equity Investees			Accumulated Other Comprehensive Loss
	($ in millions)
Third Quarter
June 30, 2015	$	(307	)		$	(82	)	$	(389	)
Other comprehensive income:
Amounts reclassified into net income	10			(1)	—			10
Tax expense	(3		)		—			(3		)
Other comprehensive income	7				—			7
September 30, 2015	$	(300	)		$	(82	)	$	(382	)

	Pensions and Other Postretirement Benefits				Other Comprehensive Loss of Equity Investees			Accumulated Other Comprehensive Loss
	($ in millions)
Third Quarter
June 30, 2014	$	(121	)		$	(62	)	$	(183	)
Other comprehensive income:
Amounts reclassified into net income	8			(1)	—			8
Tax expense	(3		)		—			(3		)
Other comprehensive income	5				—			5
September 30, 2014	$	(116	)		$	(62	)	$	(178	)

	Pensions and Other Postretirement Benefits				Other Comprehensive Loss of Equity Investees			Accumulated Other Comprehensive Loss
	($ in millions)
First Nine Months
December 31, 2014	$	(320	)		$	(78	)	$	(398	)
Other comprehensive income (loss):
Amounts reclassified into net income	31			(1)	—			31
Net loss	—				(4		)	(4		)
Tax expense	(11		)		—			(11		)
Other comprehensive income (loss)	20				(4		)	16
September 30, 2015	$	(300	)		$	(82	)	$	(382	)

	Pensions and Other Postretirement Benefits				Other Comprehensive Loss of Equity Investees			Accumulated Other Comprehensive Loss
	($ in millions)
First Nine Months
December 31, 2013	$	(310	)		$	(71	)	$	(381	)
Other comprehensive income:
Prior service benefit	367				—			367
Amounts reclassified into net income	27			(1)	—			27
Net gain (loss)	(80		)		10			(70		)
Tax expense	(120		)		(1		)	(121		)
Other comprehensive income	194				9			203
September 30, 2014	$	(116	)		$	(62	)	$	(178	)

⁽¹⁾  These items are included in the computation of net periodic pension and postretirement benefit costs. See Note 8, “Pensions and Other Postretirement Benefits” for additional information.