Retirement Benefits and Trusteed Assets (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Pension Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	$ 22	$ 20	$ 71	$ 61
Interest Cost	49	51	144	153
Expected Return on Plan Assets	(67)	(61)	(200)	(183)
Amortization of Net Actuarial Losses	55	48	156	133
Amortization of Prior Service Cost (Credit)	0	0	0	0
Amortization of Net Transition Liability			0	0
Settlements			0	2
Net Periodic Benefit Cost	59	58	171	166
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	9	15	37	51
Interest Cost	21	29	66	90
Expected Return on Plan Assets	(28)	(23)	(82)	(69)
Amortization of Net Actuarial Losses	16	21	48	60
Amortization of Prior Service Cost (Credit)	(36)	(6)	(95)	(20)
Amortization of Net Transition Liability			0	1
Settlements			0	0
Net Periodic Benefit Cost	$ (18)	$ 36	$ (26)	$ 113