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Income Taxes - United Kingdom Tax Rate Change (Details) (UNITED KINGDOM, USD $) In Millions, unless otherwise specified	1 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2011 Corporate Income Tax Rate Enacted July 2011, Effective April 1, 2012 [Member]	Jul. 31, 2012 Corporate Income Tax Rate Enacted July 2012, Effective April 1, 2012 [Member]	Jul. 31, 2012 Corporate Income Tax Rate Enacted July 2012, Effective April 1, 2013 [Member]	Jul. 31, 2010 Corporate Income Tax Rate Enacted July 2010, Effective April 1, 2011 [Member]	Jul. 31, 2011 Corporate Income Tax Rate Enacted July 2011, Effective April 1, 2011 [Member]
Schedule of United Kingdom Corporate Income Tax Rate [Line Items]
Income Tax Reconciliation, Change in Enacted Tax Rate	$ 38	$ 40
Corporate Income Tax Rate, Foreign			25.00%	24.00%	23.00%	27.00%	26.00%

The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to changes in the income tax rates under enacted tax laws in the period.

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