Retirement Benefits and Trusted 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 Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	$ 14	$ 17	$ 48	$ 55
Interest Cost	41	36	121	109
Expected Return on Plan Assets	(48)	(45)	(145)	(138)
Amortization of Net Acutuarial Losses	30	39	83	111
Amortization of Prior Service Cost (Credit)	0	1	1	1
Net Periodic Benefit Cost (Credit)	37	48	108	138
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	6	6	19	27
Interest Cost	17	16	51	50
Expected Return on Plan Assets	(21)	(18)	(63)	(55)
Amortization of Net Acutuarial Losses	3	12	11	36
Amortization of Prior Service Cost (Credit)	(27)	(27)	(82)	(72)
Net Periodic Benefit Cost (Credit)	$ (22)	$ (11)	$ (64)	$ (14)