Employee Benefit Plans (Details 4) (USD $) In Millions	Sep. 30, 2011
Unearned stock-based compensation estimated to be expensed related to unvested share-based payment awards
2011	$ 115
2012	354
2013	226
2014	116
2015	15
Total	$ 826

Unearned stock based compensation expense.

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Unearned stock-based compensation expense.

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Unearned stock based compensation expense for remaining reporting year or operating cycle.

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Unearned Stock-Based Compensation Expense for Year Four, after Remaining Reporting Year or Operating Cycle.

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Unearned Stock-Based Compensation Expense for Year One, after Remaining Reporting Year or Operating Cycle.

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Unearned Stock-Based Compensation Expense for Year Three, after Remaining Reporting Year or Operating Cycle.

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Unearned Stock-Based Compensation Expense for Year Two, after Remaining Reporting Year or Operating Cycle.

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