Employee Benefits (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2011	Jun. 30, 2011 Qualified Pension Plans [Member]	Jun. 30, 2011 Nonqualified Pension Plans [Member]	Jun. 30, 2011 Nonqualified Pension Plans [Member]	Jun. 30, 2011 Other Postretirement Benefit Plans [Member]	Jun. 30, 2011 Other Postretirement Benefit Plans [Member]	Mar. 31, 2010 Health Care Act [Member]
Aggregate severance, pension and other benefit charges attributed to voluntary incentive program for union represented employees		$ 3,900,000,000		$ 3,900,000,000
Severance costs		1,000,000,000		1,000,000,000
Number of employees included in planned workforce reductions		11,900			2,500
Pension and postretirement curtailment losses and special termination benefits		1,200,000,000		1,200,000,000
Benefit plan accounting change, pretax, rounded		1,700,000,000
Amount paid in severance benefits over the period	100,000,000		300,000,000
Postemployment benefits liability	1,300,000,000		1,300,000,000
Defined benefit plan contributions by employer						400,000,000	31,000,000	100,000,000	400,000,000	700,000,000
Health Care Act one time tax											$ 1,000,000,000