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Accumulated Other Comprehensive Income - Changes in AOCI (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Accumulated other comprehensive income balance at the beginning of the period $ 85 $ 274
Other comprehensive gains (losses) before reclassifications, net of tax 126 [1] (68) [2]
Reclassifications to net income of previously deferred (gains) losses, net of tax 13 [3] (29) [4]
Other comprehensive income (loss) 139 (97)
Accumulated other comprehensive income balance at the end of the period 224 177
Other comprehensive income, before reclassification, tax benefit (expense) (12) (2)
Reclassification from accumulated other comprehensive income, tax (benefit) expense (3) 5
Foreign Currency Translation Adjustment
    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Accumulated other comprehensive income balance at the beginning of the period 9 [5] 41 [5]
Other comprehensive gains (losses) before reclassifications, net of tax 2 [1],[5] (31) [2],[5]
Reclassifications to net income of previously deferred (gains) losses, net of tax 0 [3],[5] 0 [4],[5]
Other comprehensive income (loss) 2 [5] (31) [5]
Accumulated other comprehensive income balance at the end of the period 11 [5] 10 [5]
Other comprehensive income, before reclassification, tax benefit (expense) (11) 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 32 193
Other comprehensive gains (losses) before reclassifications, net of tax 119 [1] (35) [2]
Reclassifications to net income of previously deferred (gains) losses, net of tax 16 [3] (30) [4]
Other comprehensive income (loss) 135 (65)
Accumulated other comprehensive income balance at the end of the period 167 128
Other comprehensive income, before reclassification, tax benefit (expense) 1 (2)
Reclassification from accumulated other comprehensive income, tax (benefit) expense (4) 5
Net Investment Hedges
    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Accumulated other comprehensive income balance at the beginning of the period 95 [5] 95 [5]
Other comprehensive gains (losses) before reclassifications, net of tax 0 [1],[5] 0 [2],[5]
Reclassifications to net income of previously deferred (gains) losses, net of tax 0 [3],[5] 0 [4],[5]
Other comprehensive income (loss) 0 [5] 0 [5]
Accumulated other comprehensive income balance at the end of the period 95 [5] 95 [5]
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 (51) (55)
Other comprehensive gains (losses) before reclassifications, net of tax 5 [1] (2) [2]
Reclassifications to net income of previously deferred (gains) losses, net of tax (3) [3] 1 [4]
Other comprehensive income (loss) 2 (1)
Accumulated other comprehensive income balance at the end of the period (49) (56)
Other comprehensive income, before reclassification, tax benefit (expense) (2) 0
Reclassification from accumulated other comprehensive income, tax (benefit) expense $ 1 $ 0
[1] Net of tax benefit (expense) of $(11) million, $1 million, $0 million, $(2) million, and $(12) million, respectively.
[2] Net of tax benefit (expense) of $0 million, $(2) million, $0 million, $0 million, and $(2) million, respectively.
[3] Net of tax (benefit) expense of $0 million, $(4) million, $0 million, $1 million, and $(3) million, respectively.
[4] Net of tax (benefit) expense of $0 million, $5 million, $0 million, $0 million, and $5 million, respectively.
[5] 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.