New And Significant Accounting Policies (Reclassifications Out Of Accumulated Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013		Jun. 30, 2013
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	$ (91)		$ (101)
Other comprehensive income before reclassifications	(3)		(16)
Amortization of prior service cost	6	[1]	12	[1]
Amortization of actuarial gains	17	[1]	34	[1]
Net current period other comprehensive income	20		30
Ending balance	(71)		(71)
Pension and Other Postretirement Benefit Plans [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(101)		(105)
Other comprehensive income before reclassifications	(19)		(38)
Amortization of prior service cost	6	[1]	12	[1]
Amortization of actuarial gains	17	[1]	34	[1]
Net current period other comprehensive income	4		8
Ending balance	(97)		(97)
Other Investments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	10		4
Other comprehensive income before reclassifications	16		22
Amortization of prior service cost	0	[1]	0	[1]
Amortization of actuarial gains	0	[1]	0	[1]
Net current period other comprehensive income	16		22
Ending balance	$ 26		$ 26

[1] These other comprehensive income 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.)