Commitments, Contingencies and Guarantees - External Credit Ratings of Underlying or Referenced Assets for Credit Related Derivatives Contracts (Detail)
$ in Millions |
May 31, 2016
USD ($)
|
| Index credit default swaps [Member] |
|
| Credit Derivatives [Line Items] |
|
| External credit ratings |
$ 87.9
|
| Single name credit default swaps [Member] |
|
| Credit Derivatives [Line Items] |
|
| External credit ratings |
254.1
|
| Below Investment Grade [Member] | Index credit default swaps [Member] |
|
| Credit Derivatives [Line Items] |
|
| External credit ratings |
0.0
|
| Below Investment Grade [Member] | Single name credit default swaps [Member] |
|
| Credit Derivatives [Line Items] |
|
| External credit ratings |
174.1
|
| AAA/Aaa [Member] | Index credit default swaps [Member] |
|
| Credit Derivatives [Line Items] |
|
| External credit ratings |
4.5
|
| AAA/Aaa [Member] | Single name credit default swaps [Member] |
|
| Credit Derivatives [Line Items] |
|
| External credit ratings |
0.0
|
| AA/Aa [Member] | Index credit default swaps [Member] |
|
| Credit Derivatives [Line Items] |
|
| External credit ratings |
0.0
|
| AA/Aa [Member] | Single name credit default swaps [Member] |
|
| Credit Derivatives [Line Items] |
|
| External credit ratings |
0.0
|
| A [Member] | Index credit default swaps [Member] |
|
| Credit Derivatives [Line Items] |
|
| External credit ratings |
0.0
|
| A [Member] | Single name credit default swaps [Member] |
|
| Credit Derivatives [Line Items] |
|
| External credit ratings |
4.0
|
| BBB/Baa [Member] | Index credit default swaps [Member] |
|
| Credit Derivatives [Line Items] |
|
| External credit ratings |
83.4
|
| BBB/Baa [Member] | Single name credit default swaps [Member] |
|
| Credit Derivatives [Line Items] |
|
| External credit ratings |
$ 76.0
|