New And Significant Accounting Policies (Reclassifications Out Of Accumulated Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013		Sep. 30, 2013
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	$ (71)		$ (101)
Other comprehensive income before reclassifications	(23)		(39)
Amortization of prior service cost	6	[1]	18	[1]
Amortization of net actuarial loss	18	[1]	52	[1]
Net current period other comprehensive income (loss)	1		31
Ending balance	(70)		(70)
Other Investments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	26		4
Other comprehensive income before reclassifications	(3)		19
Amortization of prior service cost	0	[1]	0	[1]
Amortization of net actuarial loss	0	[1]	0	[1]
Net current period other comprehensive income (loss)	(3)		19
Ending balance	23		23
Pension [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(28)		(28)
Other comprehensive income before reclassifications	(20)		(58)
Amortization of prior service cost	3	[1]	9	[1]
Amortization of net actuarial loss	17	[1]	49	[1]
Net current period other comprehensive income (loss)	0		0
Ending balance	(28)		(28)
Other Benefits [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(69)		(77)
Other comprehensive income before reclassifications	0		0
Amortization of prior service cost	3	[1]	9	[1]
Amortization of net actuarial loss	1	[1]	3	[1]
Net current period other comprehensive income (loss)	4		12
Ending balance	$ (65)		$ (65)

[1] These components are included in the computation of net periodic pension and other postretirement costs. (See the Pension and Other Postretirement Benefits table above for additional details.)