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Legal Matters - Additional Information (Detail) (USD $)
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3 Months Ended | 12 Months Ended | 0 Months Ended | |
|---|---|---|---|---|
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Dec. 31, 2013
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Sep. 30, 2013
Class plaintiffs
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Jan. 27, 2014
Class plaintiffs
Subsequent Event
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Dec. 16, 2013
Interchage Litigation
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| Loss Contingencies [Line Items] | ||||
| Payments on litigation matters | $ 4,033,000,000 | |||
| Adjustment to payments for litigation | 1,100,000,000 | |||
| Damages sought by plaintiff from all defendant parties | 54,000,000,000 | |||
| Estimated compensatory damages | $ 145,000,000 | |||