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Income Taxes - Income Tax Expense (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Current taxes
Total taxes, current	$ 308us-gaap_CurrentIncomeTaxExpenseBenefit	$ 310us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred taxes (benefits)
Total taxes, deferred	15us-gaap_DeferredIncomeTaxExpenseBenefit	14us-gaap_DeferredIncomeTaxExpenseBenefit
Total taxes	$ 323us-gaap_IncomeTaxExpenseBenefit	$ 324us-gaap_IncomeTaxExpenseBenefit

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.