Retirement Benefits and Trusted Assets (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	$ 17	$ 19	$ 34	$ 38
Interest Cost	40	37	80	73
Expected Return on Plan Assets	(49)	(47)	(97)	(93)
Amortization of Net Acutuarial Losses	26	36	53	72
Amortization of Prior Service Cost (Credit)	1	0	1	0
Net Periodic Benefit Cost (Credit)	35	45	71	90
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	6	9	13	21
Interest Cost	17	16	34	34
Expected Return on Plan Assets	(21)	(19)	(42)	(37)
Amortization of Net Acutuarial Losses	5	12	8	24
Amortization of Prior Service Cost (Credit)	(28)	(28)	(55)	(45)
Net Periodic Benefit Cost (Credit)	$ (21)	$ (10)	$ (42)	$ (3)