Retirement Benefits and Trusteed 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 Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	$ 22	$ 25	$ 43	$ 49
Interest Cost	52	47	105	95
Expected Return on Plan Assets	(68)	(66)	(136)	(133)
Amortization of Net Actuarial Losses	38	50	76	101
Amortization of Prior Service Cost (Credit)	0	0	0	0
Net Periodic Benefit Cost (Credit)	44	56	88	112
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	9	12	18	28
Interest Cost	22	21	45	45
Expected Return on Plan Assets	(30)	(27)	(61)	(54)
Amortization of Net Actuarial Losses	6	15	11	32
Amortization of Prior Service Cost (Credit)	(36)	(36)	(72)	(59)
Net Periodic Benefit Cost (Credit)	$ (29)	$ (15)	$ (59)	$ (8)