Derivatives - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Mar. 31, 2013	Mar. 31, 2013 Derivatives Sold	Jun. 30, 2012 Derivatives Sold	Mar. 31, 2013 Derivatives Sold Equity Contracts	Jun. 30, 2012 Derivatives Sold Equity Contracts	Mar. 31, 2013 Derivatives Purchased	Jun. 30, 2012 Derivatives Purchased	Mar. 31, 2013 Derivatives Purchased Equity Contracts	Jun. 30, 2012 Derivatives Purchased Equity Contracts
Derivative [Line Items]
Maximum length of time hedged in cash flow hedge	3 years
Notional amounts of foreign exchange contracts designated as cash flow hedges		$ 4,500	$ 6,700
Notional amounts of foreign exchange contracts designated as fair value hedges		622	1,300
Notional amounts of foreign exchange contracts not designated as hedges		4,400	7,300			3,800	3,600
Notional amounts				1,100	982			1,100	1,400
Notional amounts of fixed-interest rate contracts not designated as hedges		1,600	1,900			1,400	3,200
Notional amounts of mortgage contracts purchased						1,200	1,100
Notional amounts of credit contracts		466	456			362	318
Notional amounts of commodity contracts not designated as hedges		284	445			1,300	1,500
Minimum required liquidity under certain counterparty agreements	1,000
Long-term unsecured debt rating	AAA
Minimum liquidity for the period as defined by certain counterparty agreements	1,000
Estimated derivative net gains (losses) included in AOCI that will be reclassified into earnings within 12 months	$ 108