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Income Taxes - Unrecognized Tax Benefits (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]      
Accrued interest payable related to unrecognized tax benefits $ 0 $ 0  
Unrecognized Tax Benefits, Interest on Income Taxes Expense 0 0  
Unrecognized Tax Benefits, Income Tax Penalties Expense 0 0 0
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized tax benefits as of January 1 648,000,000 [1] 758,000,000 [1] 864,000,000
Gross increases—tax positions in prior years 0 0 1,000,000
Gross decreases—tax positions in prior years (134,000,000) (110,000,000) (2,000,000)
Settlements 0 0 (105,000,000)
Unrecognized tax benefits as of December 31 514,000,000 [1] 648,000,000 [1] 758,000,000 [1]
Unrecognized tax benefits resulting in net operating loss carryforward $ 220,000,000 $ 648,000,000 $ 758,000,000
[1] Amounts exclude tax credits of $220 million as of December 31, 2013 and exclude tax credits and net operating losses of $648 million and $758 million as of December 31, 2012 and 2011, respectively.