Annual report pursuant to Section 13 and 15(d)

Income Taxes - Net Operating Loss and Tax Credit Carryforwards (Details)

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Income Taxes - Net Operating Loss and Tax Credit Carryforwards (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Operating Loss Carryforwards [Line Items]    
Deferred Tax Asset $ 10,967,000,000 $ 13,863,000,000
Net operating losses before benefit of federal deductions 3,100,000,000  
Valuation allowance before considering benefit of federal deductions 1,600,000,000  
Net operating losses – U.S.
    
Operating Loss Carryforwards [Line Items]    
Deferred Tax Asset 3,061,000,000  
Valuation Allowance 0  
Net Deferred Tax Asset 3,061,000,000  
Net operating losses – U.K.
    
Operating Loss Carryforwards [Line Items]    
Deferred Tax Asset 7,417,000,000  
Valuation Allowance 0  
Net Deferred Tax Asset 7,417,000,000  
Net operating losses – other non-U.S.
    
Operating Loss Carryforwards [Line Items]    
Deferred Tax Asset 489,000,000  
Valuation Allowance 366,000,000  
Net Deferred Tax Asset 123,000,000  
Net operating losses – U.S. states
    
Operating Loss Carryforwards [Line Items]    
Deferred Tax Asset 2,039,000,000 [1]  
Valuation Allowance 1,025,000,000 [1]  
Net Deferred Tax Asset 1,014,000,000 [1]  
General business credits
    
Operating Loss Carryforwards [Line Items]    
Deferred Tax Asset 4,034,000,000  
Valuation Allowance 0  
Net Deferred Tax Asset 4,034,000,000  
Foreign tax credits
    
Operating Loss Carryforwards [Line Items]    
Deferred Tax Asset 5,655,000,000  
Valuation Allowance 271,000,000  
Net Deferred Tax Asset $ 5,384,000,000  
[1] The net operating losses and related valuation allowances for U.S. states before considering the benefit of federal deductions were $3.1 billion and $1.6 billion.