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Taxation (Provision For Income Taxes) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Current tax expense	$ 481us-gaap_CurrentIncomeTaxExpenseBenefit	$ 231us-gaap_CurrentIncomeTaxExpenseBenefit	$ 305us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred tax expense	153us-gaap_DeferredIncomeTaxExpenseBenefit	249us-gaap_DeferredIncomeTaxExpenseBenefit	(35)us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for income taxes	$ 634us-gaap_IncomeTaxExpenseBenefit	$ 480us-gaap_IncomeTaxExpenseBenefit	$ 270us-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.