Pensions and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2013

Other Postretirement Benefit Plans, Defined Benefit [Member]

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Net Periodic Benefit Cost

	Other Postretirement Benefits
	Three Months Ended September 30						Nine Months Ended September 30
	2013			2012			2013			2012
	(Millions)
Service cost	$	5		$	5		$	15		$	14
Interest cost	12			12			37			38
Amortization of prior service credit	(2		)	(3		)	(7		)	(8		)
Amortization of actuarial losses	7			7			21			23
Net periodic other postretirement benefit cost	$	22		$	21		$	66		$	67

Pension Plans, Defined Benefit [Member]

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Net Periodic Benefit Cost

net periodic benefit costs for the three and nine months ended September 30, 2013 and 2012 were as follows:

	Pensions
	Three Months Ended September 30						Nine Months Ended September 30
	2013			2012			2013			2012
	(Millions)
Service cost	$	16		$	14		$	45		$	42
Interest cost	56			56			162			168
Expected return on plan assets	(72		)	(66		)	(211		)	(200		)
Amortization of actuarial losses	16			34			76			100
Settlement losses	—			—			18			—
Net periodic pension cost	$	16		$	38		$	90		$	110

PPG