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Income Taxes (Details 4) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Assets    
Tax benefit of loss carryforwards $ 527 $ 486
Liabilities currently not deductible for tax 184 163
Tax credits carryforward 73 72
Unrealized loss on cash flow hedges and retirement liabilities 51 9
Other 35 40
Deferred tax assets, Gross, Total 870 770
Valuation allowance against tax benefit of loss carryforwards (454) (444)
Other valuation allowance (103) (178)
Deferred Tax Assets, Net, Total 313 148
Liabilities    
Tax depreciation in excess of book depreciation 135 84
Other assets book value in excess of tax value 20 22
Unrealized gain on cash flow hedges and retirement liabilities 8 28
Deferred tax liabilities, total 163 134
Net deferred tax assets $ 150 $ 14