Pension And OPEB (Narrative) (Details) (USD $)	6 Months Ended							3 Months Ended	6 Months Ended		3 Months Ended
	Jun. 30, 2011	Jun. 30, 2011 Maximum [Member] Pension Plans, Defined Benefit [Member]	Jun. 30, 2011 Maximum [Member] Other Postretirement Benefit Plans, Defined Benefit [Member]	Jun. 30, 2011 Minimum [Member] Pension Plans, Defined Benefit [Member]	Jun. 30, 2011 Minimum [Member] Other Postretirement Benefit Plans, Defined Benefit [Member]	Jun. 30, 2011 Pension Plans, Defined Benefit [Member]	May 31, 2011 Pension Plans, Defined Benefit [Member]	Mar. 31, 2011 Pension Contribution [Member]	Jun. 30, 2011 Other Postretirement Benefit Plans, Defined Benefit [Member]	May 31, 2011 Other Postretirement Benefit Plans, Defined Benefit [Member]	Mar. 31, 2011 Postretirement Healthcare Plans Contribution [Member]
Pension plans, contributions								$ 415,000,000			$ 11,000,000
Defined benefit plans, weighted average discount rate percent		5.51%	5.50%	5.31%	5.30%
Expected long-term rate of return on plan assets	8.50%
Actual rate of return	6.70%
Decreased defined benefit plans, annual net benefit cost						32,000,000			6,000,000
Defined benefit plans, projected benefit and accumulated benefit obligations							$ 4,300,000,000			$ 1,200,000,000