Long-term Debt (Parenthetical) (Detail) - USD ($)
$ in Millions
Mar. 31, 2016
Nov. 30, 2015
Jun. 30, 2015
Debt Instrument [Line Items]      
Face Value $ 41,065   $ 30,463
USD Debt Issued in Period      
Debt Instrument [Line Items]      
Face Value   $ 13,000