Retirement Benefits and Trusteed Assets (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Pension Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	$ 19	$ 22	$ 62	$ 71
Interest Cost	54	49	159	144
Expected Return on Plan Assets	(69)	(67)	(205)	(200)
Amortization of Net Actuarial Losses	42	55	118	156
Amortization of Prior Service Cost (Credit)	0	0	0	0
Net Periodic Benefit Cost (Credit)	46	59	134	171
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	8	9	26	37
Interest Cost	22	21	67	66
Expected Return on Plan Assets	(31)	(28)	(92)	(82)
Amortization of Net Actuarial Losses	4	16	15	48
Amortization of Prior Service Cost (Credit)	(36)	(36)	(108)	(95)
Net Periodic Benefit Cost (Credit)	$ (33)	$ (18)	$ (92)	$ (26)