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Retirement Plans (Tables)
12 Months Ended
May 31, 2014
Retirement Plan (Tables) [Abstract]  
Schedule of Retirement Plan Costs
  2014 2013 2012
U.S. domestic and international pension plans$ 484 $ 679 $ 524
U.S. domestic and international defined contribution plans  363   354   338
U.S. domestic and international postretirement healthcare plans  78   78   70
          
  $ 925 $ 1,111 $ 932
Schedule of Weighted-Average Actuarial Assumptions for Primary U.S. Retirement Plans
Weighted-average actuarial assumptions for our primary U.S. retirement plans, which represent substantially all of our PBO and accumulated postretirement benefit obligation ("APBO"), are as follows:
  Pension Plans Postretirement Healthcare Plans
  2014 2013 2012 2014 2013 2012
                   
Discount rate used to determine benefit obligation 4.60%  4.79%  4.44%  4.70%  4.91%  4.55%
Discount rate used to determine net periodic benefit cost 4.79   4.44   5.76   4.91   4.55   5.67 
Rate of increase in future compensation levels                 
 used to determine benefit obligation 4.56   4.54   4.62   -   -   - 
Rate of increase in future compensation levels                 
 used to determine net periodic benefit cost 4.54   4.62   4.58   -   -   - 
Expected long-term rate of return on assets 7.75   8.00   8.00   -   -   - 
                   
                   
Schedule of Plan Assets at Measurement Date
  Plan Assets at Measurement Date
  2014
      Target Quoted Prices in Active Markets Other Observable Inputs Unobservable Inputs
Asset ClassFair Value Actual %  Range % Level 1 Level 2 Level 3
Cash and cash equivalents$ 313  2% 0-5% $ 55 $ 258   
Equities      35-55          
 U.S. large cap equity  5,196  24       55   5,141   
 International equities  2,652  12       2,206   446   
 Global equities  1,367  7          1,367   
 U.S. SMID cap equity  886  4       886      
 Private equities  276  1           $ 276
Fixed income securities      45-65          
 Corporate  5,758  27          5,758   
 Government  4,782  22          4,782   
 Mortgage backed and other  275  1          275   
Other  (61)  -       (61)      
  $ 21,444  100%    $ 3,141 $ 18,027 $ 276
                   
  2013
        Target Quoted Prices in Active Markets Other Observable Inputs Unobservable Inputs
Asset ClassFair Value Actual %  Range % Level 1 Level 2 Level 3
Cash and cash equivalents$ 456  2% 0 - 5% $ 15 $ 441   
Equities      35 - 55          
 U.S. large cap equity  5,264  28       37   5,227   
 International equities  2,271  12       1,904   367   
 U.S. SMID cap equity  1,741  9       1,741      
 Private equities  332  2           $ 332
Fixed income securities      45 - 65          
 Corporate  4,972  26          4,972   
 Government  3,888  20          3,888   
 Mortgage backed and other  200  1          200   
Other  (77)  -       (83)   6   
  $ 19,047  100%    $ 3,614 $ 15,101 $ 332
Schedule of Change in Fair Value of Level 3 Assets
  2014 2013
Balance at beginning of year$ 332 $ 402
Actual return on plan assets:     
 Assets held during current year  (17)   (29)
 Assets sold during the year  53   55
Purchases, sales and settlements  (92)   (96)
      
Balance at end of year$ 276 $ 332
Schedule of Changes in the Pension and Postretirement Healthcare Plans' Benefit Obligation and Fair Value of Assets and Funded Status
   Pension Plans Postretirement Healthcare Plans
   2014 2013 2014 2013
Accumulated Benefit Obligation ("ABO")$ 23,805 $ 21,958      
Changes in Projected Benefit Obligation ("PBO") and           
 Accumulated Postretirement Benefit Obligation ("APBO")           
PBO/APBO at the beginning of year$ 22,600 $ 22,187 $ 828 $ 790
 Service cost  657   692   38   42
 Interest cost  1,055   968   40   36
 Actuarial loss (gain)  1,021   (652)   5   (17)
 Benefits paid  (801)   (589)   (62)   (54)
 Other  46   (6)   34   31
PBO/APBO at the end of year$ 24,578 $ 22,600 $ 883 $ 828
              
Change in Plan Assets           
Fair value of plan assets at the beginning of year$ 19,433 $ 17,334 $ - $ -
 Actual return on plan assets  2,509   2,081   -   -
 Company contributions  727   615   28   27
 Benefits paid  (801)   (589)   (62)   (54)
 Other  39   (8)   34   27
Fair value of plan assets at the end of year$ 21,907 $ 19,433 $ - $ -
              
Funded Status of the Plans$ (2,671) $ (3,167) $ (883) $ (828)
              
Amount Recognized in the Balance Sheet at May 31:           
 Noncurrent asset$ 5         
 Current pension, postretirement healthcare and other           
  benefit obligations  (41) $ (48) $ (41) $ (39)
 Noncurrent pension, postretirement healthcare and other           
  benefit obligations  (2,635)   (3,119)   (842)   (789)
Net amount recognized$ (2,671) $ (3,167) $ (883) $ (828)
              
Amounts Recognized in AOCI and not yet reflected in            
 Net Periodic Benefit Cost:           
  Net actuarial loss (gain)$ 6,633 $ 6,993 $ 2 $ (4)
  Prior service (credit) cost and other  (670)   (781)   1   2
Total$ 5,963 $ 6,212 $ 3 $ (2)
              
Amounts Recognized in AOCI and not yet reflected in            
 Net Periodic Benefit Cost expected to be amortized in           
 next year's Net Periodic Benefit Cost:           
  Net actuarial loss$ 300 $ 378 $ - $ -
  Prior service credit and other  (115)   (114)   -   -
Total$ 185 $ 264 $ - $ -
Schedule of Components of Pension Plans
Our pension plans included the following components at May 31 (in millions):
              
     PBO Fair Value of Plan Assets Funded Status
              
2014            
 Qualified    $ 23,439 $ 21,444 $ (1,995)
 Nonqualified      280   -   (280)
 International Plans      859   463   (396)
 Total    $ 24,578 $ 21,907 $ (2,671)
              
2013            
 Qualified    $ 21,532 $ 19,047 $ (2,485)
 Nonqualified      322   -   (322)
 International Plans      746   386   (360)
 Total    $ 22,600 $ 19,433 $ (3,167)
Schedule of Fair Value of Plan Assets for Pension Plans with an Obligation in Excess of Plan Assets
   PBO Exceeds the Fair Value of Plan Assets
   2014 2013
        
Pension Benefits     
 Fair value of plan assets$ 21,543 $ 19,433
 PBO  (24,219)   (22,600)
 Net funded status$ (2,676) $ (3,167)
        
   ABO Exceeds the Fair Value of Plan Assets
   2014 2013
        
Pension Benefits     
 ABO(1)$ (23,447) $ (21,930)
        
 Fair value of plan assets  21,542   19,404
 PBO  (24,218)   (22,570)
 Net funded status$ (2,676) $ (3,166)
        

(1)ABO not used in determination of funded status.

Schedule of Pension Plans Contributions
   2014 2013
        
      
 Required$ 645 $ 560
 Voluntary  15   -
  $ 660 $ 560
        
Schedule of Net Periodic Benefit Cost
 Pension Plans Postretirement Healthcare Plans
 2014 2013 2012 2014 2013 2012
                  
Service cost$ 657 $ 692 $ 593 $ 38 $ 42 $ 35
Interest cost  1,055   968   976   40   36   36
Expected return on plan assets  (1,495)   (1,383)   (1,240)   -   -   -
Recognized actuarial losses (gains) and other  267   402   195   -   -   (1)
Net periodic benefit cost$ 484 $ 679 $ 524 $ 78 $ 78 $ 70
                  
Schedule of Amounts Recognized in Other Comprehensive Income for All Plans
Amounts recognized in OCI for all plans for the years ended May 31 were as follows (in millions):   
                          
   2014 2013
   Pension Plans Postretirement Healthcare Plans Pension Plans Postretirement Healthcare Plans
   Gross Amount Net of Tax Amount Gross Amount Net of Tax Amount Gross Amount Net of Tax Amount Gross Amount Net of Tax Amount
                          
Net (gain) loss and other                       
 arising during period$ 7 $ 8 $ 5 $ 3 $ (1,350) $ (840) $ (17) $ (21)
                        
Amortizations:                       
 Prior services credit  115   69   -   -   114   66   -   -
 Actuarial losses                       
  and other  (382)   (231)   -   -   (516)   (297)   -   -
Total recognized in OCI$ (260) $ (154) $ 5 $ 3 $ (1,752) $ (1,071) $ (17) $ (21)
Schedule of Expected Future Benefit Payments
Benefit payments, which reflect expected future service, are expected to be paid as follows for the years ending May 31 (millions):
       
 Pension Plans Postretirement Healthcare Plans 
2015 $ 912 $ 41 
2016   870   42 
2017   954   44 
2018   1,015   45 
2019   1,120   46 
2020-2024   7,398   267