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Share-Based Compensation (Summary of Stock Option Contract Term and Intrinsic Value) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Weighted Average Remaining Contractual Terms, Outstanding 5 years 4 months
Aggregated Intrinsic Value, Outstanding $ 268
Weighted Average Remaining Contractual Terms, Exercisable 4 years 4 months
Aggregated Intrinsic Value, Exercisable $ 218