Income Taxes (Reconciliation of the Effective Income Tax Rate) (Details) $ in Millions	3 Months Ended
Mar. 31, 2015 USD ($)
Repatriation of non-U.S. earnings at a cost lower than originally estimated due to an internal restructuring to simplify the Company's legal entity organization in the U.K.
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation
Aggregate discrete net tax expense (benefit) from continuing operations	$ (564)

Amount of other current and other deferred income tax expense (benefit) attributable to continuing operations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)-(b)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32672-109319

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration