NOTES PAYABLE AND OTHER BORROWINGS (Details) - USD ($) $ in Millions		12 Months Ended
		May. 31, 2015	May. 31, 2014
Notes Payable Other Borrowings [Line Items]
Total borrowings		$ 41,958	$ 24,097
Notes payable, current		1,999	1,508
Notes payable, non-current		39,959	22,589
Fair value loss		$ 74	97
3.75% senior notes due July 2014 [Member]
Notes Payable Other Borrowings [Line Items]
Senior notes	[1]		1,508
Stated interest rate percentage		3.75%
Maturity date		Jul. 08, 2014
Fair value loss	[1]		8
5.25% senior notes due January 2016 [Member]
Notes Payable Other Borrowings [Line Items]
Senior notes		$ 1,999	1,998
Stated interest rate percentage		5.25%
Maturity date		Jan. 15, 2016
Unamortized discount and issuance costs on debt issued		$ 1	2
Floating rate senior notes due July 2017 [Member]
Notes Payable Other Borrowings [Line Items]
Senior notes		$ 999
Maturity date		Jul. 07, 2017
Unamortized discount and issuance costs on debt issued		$ 1
1.20% senior notes due October 2017 [Member]
Notes Payable Other Borrowings [Line Items]
Senior notes		$ 2,494	2,491
Stated interest rate percentage		1.20%
Maturity date		Oct. 15, 2017
Unamortized discount and issuance costs on debt issued		$ 6	9
5.75% senior notes due April 2018 [Member]
Notes Payable Other Borrowings [Line Items]
Senior notes		$ 2,493	2,492
Stated interest rate percentage		5.75%
Maturity date		Apr. 15, 2018
Unamortized discount and issuance costs on debt issued		$ 7	8
Floating rate senior notes due January 2019 [Member]
Notes Payable Other Borrowings [Line Items]
Senior notes		$ 499	499
Maturity date		Jan. 15, 2019
Unamortized discount and issuance costs on debt issued		$ 1	1
2.375% senior notes due January 2019 [Member]
Notes Payable Other Borrowings [Line Items]
Senior notes	[1]	$ 1,514	1,506
Stated interest rate percentage		2.375%
Maturity date		Jan. 15, 2019
Fair value loss	[1]	$ 21	15
Unamortized discount and issuance costs on debt issued		7	9
5.00% senior notes due July 2019 [Member]
Notes Payable Other Borrowings [Line Items]
Senior notes		$ 1,739	1,738
Stated interest rate percentage		5.00%
Maturity date		Jul. 08, 2019
Unamortized discount and issuance costs on debt issued		$ 11	12
Floating rate senior notes due October 2019 [Member]
Notes Payable Other Borrowings [Line Items]
Senior notes		$ 748
Maturity date		Oct. 08, 2019
Unamortized discount and issuance costs on debt issued		$ 2
2.25% senior notes due October 2019 [Member]
Notes Payable Other Borrowings [Line Items]
Senior notes	[1]	$ 2,015
Stated interest rate percentage		2.25%
Maturity date		Oct. 08, 2019
Fair value loss	[1]	$ 22
Unamortized discount and issuance costs on debt issued		7
3.875% senior notes due July 2020 [Member]
Notes Payable Other Borrowings [Line Items]
Senior notes		$ 996	995
Stated interest rate percentage		3.875%
Maturity date		Jul. 15, 2020
Unamortized discount and issuance costs on debt issued		$ 4	5
2.25% senior notes due January 2021 [Member]
Notes Payable Other Borrowings [Line Items]
Senior notes	[2]	$ 1,341	1,685
Stated interest rate percentage		2.25%
Maturity date		Jan. 10, 2021
Unamortized discount and issuance costs on debt issued	[2]	$ 11	14
2.80% senior notes due July 2021 [Member]
Notes Payable Other Borrowings [Line Items]
Senior notes	[1]	$ 1,525
Stated interest rate percentage		2.80%
Maturity date		Jul. 08, 2021
Fair value loss	[1]	$ 31
Unamortized discount and issuance costs on debt issued		6
2.50% senior notes due May 2022 [Member]
Notes Payable Other Borrowings [Line Items]
Senior notes		$ 2,483
Stated interest rate percentage		2.50%
Maturity date		May 15, 2022
Unamortized discount and issuance costs on debt issued		$ 17
2.50% senior notes due October 2022 [Member]
Notes Payable Other Borrowings [Line Items]
Senior notes		$ 2,490	2,489
Stated interest rate percentage		2.50%
Maturity date		Oct. 15, 2022
Unamortized discount and issuance costs on debt issued		$ 10	11
3.625% senior notes due July 2023 [Member]
Notes Payable Other Borrowings [Line Items]
Senior notes		$ 989	988
Stated interest rate percentage		3.625%
Maturity date		Jul. 15, 2023
Unamortized discount and issuance costs on debt issued		$ 11	12
3.40% senior notes due July 2024 [Member]
Notes Payable Other Borrowings [Line Items]
Senior notes		$ 1,988
Stated interest rate percentage		3.40%
Maturity date		Jul. 08, 2024
Unamortized discount and issuance costs on debt issued		$ 12
2.95% senior notes due May 2025 [Member]
Notes Payable Other Borrowings [Line Items]
Senior notes		$ 2,478
Stated interest rate percentage		2.95%
Maturity date		May 15, 2025
Unamortized discount and issuance costs on debt issued		$ 22
3.125% senior notes due July 2025 [Member]
Notes Payable Other Borrowings [Line Items]
Senior notes	[2]	$ 804	1,013
Stated interest rate percentage		3.125%
Maturity date		Jul. 10, 2025
Unamortized discount and issuance costs on debt issued	[2]	$ 6	9
3.25% senior notes due May 2030 [Member]
Notes Payable Other Borrowings [Line Items]
Senior notes		$ 494
Stated interest rate percentage		3.25%
Maturity date		May 15, 2030
Unamortized discount and issuance costs on debt issued		$ 6
4.30% senior notes due July 2034 [Member]
Notes Payable Other Borrowings [Line Items]
Senior notes		$ 1,737
Stated interest rate percentage		4.30%
Maturity date		Jul. 08, 2034
Unamortized discount and issuance costs on debt issued		$ 13
3.90% senior notes due May 2035 [Member]
Notes Payable Other Borrowings [Line Items]
Senior notes		$ 1,232
Stated interest rate percentage		3.90%
Maturity date		May 15, 2035
Unamortized discount and issuance costs on debt issued		$ 18
6.50% senior notes due April 2038 [Member]
Notes Payable Other Borrowings [Line Items]
Senior notes		$ 1,245	1,244
Stated interest rate percentage		6.50%
Maturity date		Apr. 15, 2038
Unamortized discount and issuance costs on debt issued		$ 5	6
6.125% senior notes due July 2039 [Member]
Notes Payable Other Borrowings [Line Items]
Senior notes		$ 1,238	1,236
Stated interest rate percentage		6.125%
Maturity date		Jul. 08, 2039
Unamortized discount and issuance costs on debt issued		$ 12	14
5.375% senior notes due July 2040 [Member]
Notes Payable Other Borrowings [Line Items]
Senior notes		$ 2,216	2,215
Stated interest rate percentage		5.375%
Maturity date		Jul. 15, 2040
Unamortized discount and issuance costs on debt issued		$ 34	$ 35
4.50% senior notes due July 2044 [Member]
Notes Payable Other Borrowings [Line Items]
Senior notes		$ 992
Stated interest rate percentage		4.50%
Maturity date		Jul. 08, 2044
Unamortized discount and issuance costs on debt issued		$ 8
4.125% senior notes due May 2045 [Member]
Notes Payable Other Borrowings [Line Items]
Senior notes		$ 1,976
Stated interest rate percentage		4.125%
Maturity date		May 15, 2045
Unamortized discount and issuance costs on debt issued		$ 24
4.375% senior notes due May 2055 [Member]
Notes Payable Other Borrowings [Line Items]
Senior notes		$ 1,234
Stated interest rate percentage		4.375%
Maturity date		May 15, 2055
Unamortized discount and issuance costs on debt issued		$ 16

[1] Refer to Note 11 for a description of our accounting for fair value hedges.

[2] Euro based notes valued at May 31, 2015 and May 31,2014 foreign exchange rates, respectively (see further discussion below)