Derivatives - Additional Information (Detail) (USD $)	9 Months Ended
	Mar. 31, 2012	Mar. 31, 2012 Derivatives Purchased	Jun. 30, 2011 Derivatives Purchased	Mar. 31, 2012 Derivatives Purchased Equity Contracts	Jun. 30, 2011 Derivatives Purchased Equity Contracts	Mar. 31, 2012 Derivatives Sold	Jun. 30, 2011 Derivatives Sold	Mar. 31, 2012 Derivatives Sold Equity Contracts	Jun. 30, 2011 Derivatives Sold Equity Contracts
Derivative [Line Items]
Notional amounts of foreign exchange contracts designated as cash flow hedges						$ 7,800,000,000	$ 10,600,000,000
Notional amounts of foreign exchange contracts designated as fair value hedges						543,000,000	572,000,000
Notional amounts of foreign exchange contracts not designated as hedges		3,100,000,000	4,300,000,000			3,900,000,000	7,100,000,000
Notional amounts				1,200,000,000	1,100,000,000			1,000,000,000	860,000,000
Notional amounts of fixed-interest rate contracts not designated as hedges		2,600,000,000	2,300,000,000			1,000,000,000	697,000,000
Notional amounts of mortgage contracts purchased		1,100,000,000	868,000,000
Notional amounts of credit contracts		260,000,000	532,000,000			323,000,000	281,000,000
Notional amounts of commodity contracts not designated as hedges		1,500,000,000	1,900,000,000			440,000,000	502,000,000
Minimum required liquidity under certain counterparty agreements	1,000,000,000
Long-term unsecured debt rating	AAA
Minimum liquidity for the period as defined by certain counterparty agreements	1,000,000,000
Estimated derivative net gains (losses) included in OCI that will be reclassified into earnings within 12 months	$ 46,000,000