Income Taxes (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Tax loss carryforwards:
U.S. Federal	$ 41	$ 96
State	45	43
Foreign	57	56
Investment tax credit benefits	45	46
Postretirement benefits other than pensions	54	52
Pensions	79	55
Bad debts	3	3
Sales allowances	6	6
Payroll and other accruals	98	93
Valuation allowance	(225)	(247)
Total deferred tax assets	203	203
Deferred tax liabilities
Tax over book depreciation	65	82
Other	62	54
Total deferred tax liabilities	127	136
Net deferred tax assets	$ 76	$ 67