Postretirement Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2011

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Effect on operations of the pension plans

	Principal Pension Plans
	Three months ended June 30				Six months ended June 30
(In millions)	2011		2010		2011		2010
Service cost for benefits earned	$	283	$	277	$	561	$	569
Prior service cost amortization		49		59		95		119
Expected return on plan assets		(985)		(1,084)		(1,969)		(2,170)
Interest cost on benefit obligation		667		667		1,330		1,342
Net actuarial loss amortization		596		329		1,168		662
Pension plans cost	$	610	$	248	$	1,185	$	522

	Other Pension Plans
	Three months ended June 30				Six months ended June 30
(In millions)	2011		2010		2011		2010
Service cost for benefits earned	$	72	$	62	$	140	$	144
Prior service cost amortization		4		4		8		8
Expected return on plan assets		(152)		(124)		(300)		(254)
Interest cost on benefit obligation		130		120		256		244
Net actuarial loss amortization		35		52		69		111
Pension plans cost	$	89	$	114	$	173	$	253

Effect on operations of principal retiree health and life insurance plans

	Principal Retiree Health
	and Life Insurance Plans
	Three months ended June 30				Six months ended June 30
(In millions)	2011		2010		2011		2010
Service cost for benefits earned	$	45	$	54	$	92	$	112
Prior service cost amortization		159		158		319		316
Expected return on plan assets		(24)		(29)		(48)		(58)
Interest cost on benefit obligation		150		175		301		350
Net actuarial gain amortization		(27)		(6)		(56)		(12)
Retiree benefit plans cost	$	303	$	352	$	608	$	708