v3.19.2
Derivatives - Additional Information (Detail) - USD ($)
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Derivative [Line Items]    
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  
Gross amounts of derivative assets, elected to offset 247,000,000 $ 533,000,000
Gross amounts of derivative liabilities, elected to offset 272,000,000 $ 207,000,000
Estimated derivative net gains (losses) included in AOCI that will be reclassified into earnings within 12 months $ 0  
Senior Unsecured Obligations    
Derivative [Line Items]    
Debt instrument credit rating AAA