Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2017

Employee Benefit Plans [Abstract]

Components of Net Periodic Benefit Cost

Table 58: Components of Net Periodic Benefit Cost

	Qualified Pension Plan						Nonqualified Retirement Plans				Postretirement Benefits
Three months ended September 30 In millions	2017			2016			2017		2016		2017			2016
Net periodic cost consists of:
Service cost	$	26		$	26		$	1	$	1	$	2		$	1
Interest cost	45			46			2		3		3			4
Expected return on plan assets	(71		)	(70		)					(2		)	(1		)
Amortization of prior service credit	(1		)	(2		)
Amortization of actuarial losses	11			12			1		1
Net periodic cost/(benefit)	$	10		$	12		$	4	$	5	$	3		$	4

	Qualified Pension Plan						Nonqualified Retirement Plans				Postretirement Benefits
Nine months ended September 30 In millions	2017			2016			2017		2016		2017			2016
Net periodic cost consists of:
Service cost	$	77		$	77		$	2	$	2	$	4		$	4
Interest cost	134			139			8		9		10			11
Expected return on plan assets	(213		)	(211		)					(4		)	(3		)
Amortization of prior service credit	(3		)	(5		)					(1		)	(1		)
Amortization of actuarial losses	33			34			3		3
Net periodic cost/(benefit)	$	28		$	34		$	13	$	14	$	9		$	11