Derivatives - Additional Information (Detail) - USD ($)
|
9 Months Ended |
|
Mar. 31, 2016 |
Jun. 30, 2015 |
| Derivative [Line Items] |
|
|
| Maximum length of time hedged in cash flow hedge |
3 years
|
|
| Minimum required liquidity under certain counterparty agreements |
$ 1,000,000,000
|
|
| Minimum liquidity for the period as defined by certain counterparty agreements |
1,000,000,000
|
|
| Estimated derivative net gains (losses) included in AOCI that will be reclassified into earnings within 12 months |
$ 290,000,000
|
|
| Senior Unsecured Obligations |
|
|
| Derivative [Line Items] |
|
|
| Debt instrument credit rating |
AAA
|
|
| Derivatives Sold | Equity Contracts |
|
|
| Derivative [Line Items] |
|
|
| Notional amounts |
$ 2,100,000,000
|
$ 2,600,000,000
|
| Derivatives Sold | Designated Hedge Derivatives | Equity Contracts |
|
|
| Derivative [Line Items] |
|
|
| Notional amounts |
948,000,000
|
1,400,000,000
|
| Derivatives Sold | Non-designated Hedge Derivatives | Foreign Exchange Contracts |
|
|
| Derivative [Line Items] |
|
|
| Notional amounts |
6,000,000,000
|
11,000,000,000
|
| Derivatives Sold | Non-designated Hedge Derivatives | Interest Rate Contracts |
|
|
| Derivative [Line Items] |
|
|
| Notional amounts |
2,500,000,000
|
3,200,000,000
|
| Derivatives Sold | Non-designated Hedge Derivatives | Credit Contracts |
|
|
| Derivative [Line Items] |
|
|
| Notional amounts |
281,000,000
|
430,000,000
|
| Derivatives Sold | Non-designated Hedge Derivatives | Commodity Contracts |
|
|
| Derivative [Line Items] |
|
|
| Notional amounts |
163,000,000
|
316,000,000
|
| Derivatives Sold | Cash flow hedging | Foreign Exchange Contracts |
|
|
| Derivative [Line Items] |
|
|
| Notional amounts |
9,800,000,000
|
9,800,000,000
|
| Derivatives Sold | Fair value hedging | Foreign Exchange Contracts |
|
|
| Derivative [Line Items] |
|
|
| Notional amounts |
5,000,000,000
|
5,300,000,000
|
| Derivatives Purchased | Equity Contracts |
|
|
| Derivative [Line Items] |
|
|
| Notional amounts |
1,400,000,000
|
2,200,000,000
|
| Derivatives Purchased | Designated Hedge Derivatives | Equity Contracts |
|
|
| Derivative [Line Items] |
|
|
| Notional amounts |
697,000,000
|
1,100,000,000
|
| Derivatives Purchased | Non-designated Hedge Derivatives | Foreign Exchange Contracts |
|
|
| Derivative [Line Items] |
|
|
| Notional amounts |
8,600,000,000
|
9,700,000,000
|
| Derivatives Purchased | Non-designated Hedge Derivatives | Interest Rate Contracts |
|
|
| Derivative [Line Items] |
|
|
| Notional amounts |
356,000,000
|
1,000,000,000
|
| Derivatives Purchased | Non-designated Hedge Derivatives | Mortgage-backed securities |
|
|
| Derivative [Line Items] |
|
|
| Notional amounts |
534,000,000
|
812,000,000
|
| Derivatives Purchased | Non-designated Hedge Derivatives | Credit Contracts |
|
|
| Derivative [Line Items] |
|
|
| Notional amounts |
468,000,000
|
618,000,000
|
| Derivatives Purchased | Non-designated Hedge Derivatives | Commodity Contracts |
|
|
| Derivative [Line Items] |
|
|
| Notional amounts |
$ 613,000,000
|
$ 882,000,000
|