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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]    
Tax benefit of loss carryforwards $ 610 $ 628
Liabilities currently not deductible for tax 337 263
Tax credit carryforwards 34 35
Unrealized loss on cash flow hedges and retirement liabilities 39 48
Other 11 0
Deferred tax assets, Gross, Total 1,031 974
Valuation allowance against tax benefit of loss carryforwards (528) (504)
Other valuation allowance (111) (45)
Deferred tax assets, Net, Total 392 425
Tax depreciation in excess of book depreciation 170 199
Other assets book value in excess of tax value 15 77
Unrealized gain on cash flow hedges and retirement liabilities 21 19
Other 0 30
Deferred tax liabilities, Total 206 325
Net deferred tax assets $ 186 $ 100