Employee Benefit Plans (Details 4) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012
Unearned stock-based compensation estimated to be expensed related to unvested share-based payment awards
2012	$ 120
2013	384
2014	254
2015	131
2016	22
Total	$ 911

Unearned stock based compensation expense.

No definition available.

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

No definition available.

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Unearned stock-based compensation expense for year four, after remaining reporting year or operating cycle.

No definition available.

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Unearned stock-based compensation expense for year one, after remaining reporting year or operating cycle.

No definition available.

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Unearned stock-based compensation expense for year three, after remaining reporting year or operating cycle.

No definition available.

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Unearned stock-based compensation expense for year two, after remaining reporting year or operating cycle.

No definition available.

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