Accumulated Other Comprehensive Income - Changes in AOCI (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Feb. 28, 2014
Feb. 28, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Accumulated other comprehensive income balance at the beginning of the period $ 90 $ 274
Other comprehensive gains (losses) before reclassifications, net of tax (68) [1] (209) [1]
Reclassifications to net income of previously deferred (gains) losses, net of tax 11 [2] (32) [2]
Other comprehensive income (loss) (57) (241)
Accumulated other comprehensive income balance at the end of the period 33 33
Other comprehensive income, before reclassification, tax benefit (expense) 5 12
Reclassification from accumulated other comprehensive income, tax (benefit) expense (1) 9
Foreign Currency Translation Adjustment
    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Accumulated other comprehensive income balance at the beginning of the period 24 [3] 41 [3]
Other comprehensive gains (losses) before reclassifications, net of tax (34) [1],[3] (51) [1],[3]
Reclassifications to net income of previously deferred (gains) losses, net of tax 0 [2],[3] 0 [2],[3]
Other comprehensive income (loss) (34) [3] (51) [3]
Accumulated other comprehensive income balance at the end of the period (10) [3] (10) [3]
Other comprehensive income, before reclassification, tax benefit (expense) 0 0
Reclassification from accumulated other comprehensive income, tax (benefit) expense 0 0
Cash Flow Hedges
    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Accumulated other comprehensive income balance at the beginning of the period 28 193
Other comprehensive gains (losses) before reclassifications, net of tax (31) [1] (151) [1]
Reclassifications to net income of previously deferred (gains) losses, net of tax 10 [2] (35) [2]
Other comprehensive income (loss) (21) (186)
Accumulated other comprehensive income balance at the end of the period 7 7
Other comprehensive income, before reclassification, tax benefit (expense) 5 12
Reclassification from accumulated other comprehensive income, tax (benefit) expense (1) 9
Net Investment Hedges
    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Accumulated other comprehensive income balance at the beginning of the period 95 [3] 95 [3]
Other comprehensive gains (losses) before reclassifications, net of tax 0 [1],[3] 0 [1],[3]
Reclassifications to net income of previously deferred (gains) losses, net of tax 0 [2],[3] 0 [2],[3]
Other comprehensive income (loss) 0 [3] 0 [3]
Accumulated other comprehensive income balance at the end of the period 95 [3] 95 [3]
Other comprehensive income, before reclassification, tax benefit (expense) 0 0
Reclassification from accumulated other comprehensive income, tax (benefit) expense 0 0
Other
    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Accumulated other comprehensive income balance at the beginning of the period (57) (55)
Other comprehensive gains (losses) before reclassifications, net of tax (3) [1] (7) [1]
Reclassifications to net income of previously deferred (gains) losses, net of tax 1 [2] 3 [2]
Other comprehensive income (loss) (2) (4)
Accumulated other comprehensive income balance at the end of the period (59) (59)
Other comprehensive income, before reclassification, tax benefit (expense) 0 0
Reclassification from accumulated other comprehensive income, tax (benefit) expense $ 0 $ 0
[1] Net of tax benefit (expense) of $0 million, $12 million, $0 million, $0 million, and $12 million, respectively.
[2] Net of tax (benefit) expense of $0 million, $9 million, $0 million, $0 million, and $9 million, respectively.
[3] The accumulated foreign currency translation adjustment and net investment hedge gains/losses related to an investment in a foreign subsidiary are reclassified to net income upon sale or upon complete or substantially complete liquidation of the respective entity.