v3.3.1.900
Accumulated Other Comprehensive Income - Changes in AOCI (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Nov. 30, 2015
Aug. 31, 2015
Nov. 30, 2014
Nov. 30, 2015
Nov. 30, 2014
May. 31, 2015
Aug. 31, 2014
May. 31, 2014
AOCI Including Portion Attributable to Noncontrolling, net of Tax [Roll Forward]                
Accumulated other comprehensive income balance at the beginning of the period $ 833 $ 1,246 $ 224 $ 1,246 $ 85      
Other comprehensive gains (losses) before reclassifications, net of tax 407 [1]   326 [2] 184 [3] 452 [4]      
Reclassifications to net income of previously deferred (gains) losses, net of tax (133) [5]   (25) [6] (323) [7] (12) [8]      
Total other comprehensive income (loss), net of tax 274   301 (139) 440      
Accumulated other comprehensive income balance at the end of the period 1,107 833 525 1,107 525      
Other comprehensive income, before reclassification, tax benefit (expense) 16   (18) 14 (30)      
Reclassification from accumulated other comprehensive income, tax (benefit) expense 0   (1) 1 (4)      
Foreign Currency Translation Adjustment                
AOCI Including Portion Attributable to Noncontrolling, net of Tax [Roll Forward]                
Accumulated other comprehensive income balance at the beginning of the period (112) [9],[10] (31) [11],[12] (9) [13],[14] (31) [11],[12] (11) [15],[16]      
Other comprehensive gains (losses) before reclassifications, net of tax (29) [1],[9],[10]   (34) [2],[13],[14] (110) [3],[11],[12] (32) [4],[15],[16]      
Reclassifications to net income of previously deferred (gains) losses, net of tax 0 [5],[9],[10]   0 [6],[13],[14] 0 [7],[11],[12] 0 [8],[15],[16]      
Total other comprehensive income (loss), net of tax (29) [9],[10]   (34) [13],[14] (110) [11],[12] (32) [15],[16]      
Accumulated other comprehensive income balance at the end of the period (141) [9],[10],[11],[12] (112) [9],[10] (43) [13],[14],[15],[16] (141) [9],[10],[11],[12] (43) [13],[14],[15],[16]      
Other comprehensive income, before reclassification, tax benefit (expense) 0   11 0 0      
Reclassification from accumulated other comprehensive income, tax (benefit) expense 0   0 0 0      
Cash Flow Hedges                
AOCI Including Portion Attributable to Noncontrolling, net of Tax [Roll Forward]                
Accumulated other comprehensive income balance at the beginning of the period 891 1,220 [17] 167 1,220 [17] 32      
Other comprehensive gains (losses) before reclassifications, net of tax 425 [1]   351 [2] 283 [3],[17] 470 [4]      
Reclassifications to net income of previously deferred (gains) losses, net of tax (135) [5]   (18) [6] (322) [7],[17] (2) [8]      
Total other comprehensive income (loss), net of tax 290   333 (39) [17] 468      
Accumulated other comprehensive income balance at the end of the period 1,181 [17] 891 500 1,181 [17] 500      
Other comprehensive income, before reclassification, tax benefit (expense) 18   (28) 16 (27)      
Reclassification from accumulated other comprehensive income, tax (benefit) expense 0   (3) 1 (7)      
Net Investment Hedges                
AOCI Including Portion Attributable to Noncontrolling, net of Tax [Roll Forward]                
Accumulated other comprehensive income balance at the beginning of the period 115 [9],[10] 115 [11],[12] 115 [13],[14] 115 [11],[12] 115 [15],[16]      
Other comprehensive gains (losses) before reclassifications, net of tax 0 [1],[9],[10]   0 [2],[13],[14] 0 [3],[11],[12] 0 [4],[15],[16]      
Reclassifications to net income of previously deferred (gains) losses, net of tax 0 [5],[9],[10]   0 [6],[13],[14] 0 [7],[11],[12] 0 [8],[15],[16]      
Total other comprehensive income (loss), net of tax 0 [9],[10]   0 [13],[14] 0 [11],[12] 0 [15],[16]      
Accumulated other comprehensive income balance at the end of the period 115 [9],[10],[11],[12] 115 [9],[10] 115 [13],[14],[15],[16] 115 [9],[10],[11],[12] 115 [13],[14],[15],[16]      
Other comprehensive income, before reclassification, tax benefit (expense) 0   0 0 0      
Reclassification from accumulated other comprehensive income, tax (benefit) expense 0   0 0 0      
Other                
AOCI Including Portion Attributable to Noncontrolling, net of Tax [Roll Forward]                
Accumulated other comprehensive income balance at the beginning of the period (61) (58) (49) (58) (51)      
Other comprehensive gains (losses) before reclassifications, net of tax 11 [1]   9 [2] 11 [3] 14 [4]      
Reclassifications to net income of previously deferred (gains) losses, net of tax 2 [5]   (7) [6] (1) [7] (10) [8]      
Total other comprehensive income (loss), net of tax 13   2 10 4      
Accumulated other comprehensive income balance at the end of the period (48) (61) (47) (48) (47)      
Other comprehensive income, before reclassification, tax benefit (expense) (2)   (1) (2) (3)      
Reclassification from accumulated other comprehensive income, tax (benefit) expense 0   2 0 3      
Revisions                
AOCI Including Portion Attributable to Noncontrolling, net of Tax [Roll Forward]                
Accumulated other comprehensive income balance at the beginning of the period $ 20 20 $ 20 $ 20 $ 20      
Accumulated other comprehensive income balance at the end of the period   20            
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives   40            
Translation adjustment for net investment hedge   $ 20       $ 20 $ 20 $ 20
[1] Net of tax benefit (expense) of $0 million, $18 million, $0 million, $(2) million and $16 million, respectively.
[2] Net of tax benefit (expense) of $11 million, $(28) million, $0 million, $(1) million and $(18) million, respectively.
[3] Net of tax benefit (expense) of $0 million, $16 million, $0 million, $(2) million and $14 million, respectively.
[4] Net of tax benefit (expense) of $0 million, $(27) million, $0 million, $(3) million and $(30) million, respectively.
[5] Net of tax (benefit) expense of $0 million, $0 million, $0 million, $0 million and $0 million, respectively.
[6] Net of tax (benefit) expense of $0 million, $(3) million, $0 million, $2 million and $(1) million, respectively.
[7] Net of tax (benefit) expense of $0 million, $1 million, $0 million, $0 million and $1 million, respectively.
[8] Net of tax (benefit) expense of $0 million, $(7) million, $0 million, $3 million and $(4) million, respectively.
[9] Beginning balances have been updated to reflect the proper classification of $20 million of deferred tax balances between Foreign Currency Translation Adjustment and Net Investment Hedges.
[10] 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.
[11] Beginning balances have been updated to reflect the proper classification of $20 million of deferred tax balances between Foreign Currency Translation Adjustment and Net Investment Hedges.
[12] 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.
[13] Beginning and ending balances have been updated to reflect the proper classification of $20 million of deferred tax balances between Foreign Currency Translation Adjustment and Net Investment Hedges.
[14] 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.
[15] Beginning and ending balances have been updated to reflect the proper classification of $20 million of deferred tax balances between Foreign Currency Translation Adjustment and Net Investment Hedges.
[16] 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.
[17] Certain amounts have been updated to reflect the proper classification of $40 million between Other comprehensive gains (losses) before reclassifications and Reclassifications to net income of previously deferred (gains) losses for the three months ended August 31, 2015.