Income Taxes - Net Operating Loss and Tax Credit Carryforwards (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Deferred Tax Asset	$ 9,787,000,000	$ 10,967,000,000
Net operating losses before benefit of federal deductions	1,800,000,000
Valuation allowance before considering benefit of federal deductions	708,000,000
Net operating losses – U.S.
Operating Loss Carryforwards [Line Items]
Deferred Tax Asset	3,065,000,000
Valuation Allowance	0
Net Deferred Tax Asset	3,065,000,000
Net operating losses – U.K. and other
Operating Loss Carryforwards [Line Items]
Deferred Tax Asset	446,000,000
Valuation Allowance	(316,000,000)
Net Deferred Tax Asset	130,000,000
Net operating losses – U.S. states
Operating Loss Carryforwards [Line Items]
Deferred Tax Asset	1,168,000,000
Valuation Allowance	(460,000,000)
Net Deferred Tax Asset	708,000,000
UNITED KINGDOM \| Net operating losses – U.K. and other
Operating Loss Carryforwards [Line Items]
Deferred Tax Asset	6,276,000,000
Valuation Allowance	0
Net Deferred Tax Asset	6,276,000,000
General business credits
Tax Credit Carryforward [Line Items]
Deferred Tax Asset	3,383,000,000
Valuation Allowance	0
Net Deferred Tax Asset	3,383,000,000
Foreign tax credits
Tax Credit Carryforward [Line Items]
Deferred Tax Asset	2,231,000,000
Valuation Allowance	(68,000,000)
Net Deferred Tax Asset	$ 2,163,000,000

Deferred Tax Asset, Operating Loss Carryforwards, Before Federal Deductions

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Deferred Tax Assets, Operating Loss Carryforwards, Net of Valuation Allowance

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Deferred Tax Assets, Tax Credit Carryforwards, Net of Valuation Allowance

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Operating Loss Carryforwards, Valuation Allowance, Before Federal Deductions

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax asset, before valuation allowance, attributable to deductible other tax carryforwards.

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Amount of valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from tax credit carryforwards for which it is more likely than not that a tax benefit will not be realized.

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