Commitments, Contingencies and Guarantees - Guarantees (Detail) $ in Millions	May. 31, 2015 USD ($)
Guarantee Obligations [Line Items]
Notional/ Maximum Payout	$ 6,459.7
Derivative contracts - non-credit related [Member]
Guarantee Obligations [Line Items]
2015	28,156.7
2016	3,319.6
2017 and 2018	614.6
2019 and 2020	644.4
2021 and Later	430.6
Notional/ Maximum Payout	33,165.9
Written derivative contracts - credit related [Member]
Guarantee Obligations [Line Items]
2015	2.0
2016	0.0
2017 and 2018	0.0
2019 and 2020	1,436.3
2021 and Later	20.0
Notional/ Maximum Payout	1,458.3
Derivatives [Member]
Guarantee Obligations [Line Items]
2015	28,158.7
2016	3,319.6
2017 and 2018	614.6
2019 and 2020	2,080.7
2021 and Later	450.6
Notional/ Maximum Payout	$ 34,624.2