Debt - Short and Long-Term Debt (Details)	Nov. 30, 2020 USD ($)	Nov. 30, 2020 GBP (£)	Nov. 30, 2020 EUR (€)	Oct. 20, 2020 GBP (£)	Aug. 31, 2020 USD ($)	Apr. 15, 2020 USD ($)
Debt Instrument [Line Items]
Total short-term debt	$ 5,245,000,000				$ 3,538,000,000
Total long-term debt, less current portion	$ 10,973,000,000				12,203,000,000
2.875% unsecured Pound sterling notes due 2020
Debt Instrument [Line Items]
Face amount | £		£ 700,000,000
Stated interest rate	2.875%	2.875%	2.875%	2.875%
Total short-term debt	$ 0				533,000,000
Debt redeemed | £				£ 400,000,000
3.300% unsecured notes due 2021
Debt Instrument [Line Items]
Face amount	$ 8,000,000,000
Stated interest rate	3.30%	3.30%	3.30%
Total short-term debt	$ 1,249,000,000				0
Total $1.5 billion debt issuance
Debt Instrument [Line Items]
Face amount						$ 1,500,000,000
Other
Debt Instrument [Line Items]
Total short-term debt	718,000,000				418,000,000
Unsecured Notes
Debt Instrument [Line Items]
Other	34,000,000				24,000,000
Total long-term debt, less current portion	$ 10,973,000,000				12,203,000,000
Unsecured Notes | 3.300% unsecured notes due 2021
Debt Instrument [Line Items]
Stated interest rate	3.30%	3.30%	3.30%
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment	$ 0				1,248,000,000
Unsecured Notes | Total $1.5 billion debt issuance
Debt Instrument [Line Items]
Face amount	$ 1,500,000,000
Unsecured Notes | 3.200% unsecured notes due 2030
Debt Instrument [Line Items]
Face amount						$ 500,000,000
Stated interest rate	3.20%	3.20%	3.20%			3.20%
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment	$ 497,000,000				497,000,000
Unsecured Notes | 4.100% unsecured notes due 2050
Debt Instrument [Line Items]
Face amount						$ 1,000,000,000.0
Stated interest rate	4.10%	4.10%	4.10%			4.10%
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment	$ 990,000,000				990,000,000
Unsecured Notes | Total $6.0 billion debt issuance
Debt Instrument [Line Items]
Face amount	$ 6,000,000,000
Unsecured Notes | 3.450% unsecured notes due 2026
Debt Instrument [Line Items]
Stated interest rate	3.45%	3.45%	3.45%
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment	$ 1,892,000,000				1,891,000,000
Unsecured Notes | 4.650% unsecured notes due 2046
Debt Instrument [Line Items]
Stated interest rate	4.65%	4.65%	4.65%
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment	$ 591,000,000				591,000,000
Unsecured Notes | Total $8.0 billion debt issuance
Debt Instrument [Line Items]
Face amount	$ 8,000,000,000
Unsecured Notes | 3.800% unsecured notes due 2024
Debt Instrument [Line Items]
Stated interest rate	3.80%	3.80%	3.80%
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment	$ 1,994,000,000				1,993,000,000
Unsecured Notes | 4.500% unsecured notes due 2034
Debt Instrument [Line Items]
Stated interest rate	4.50%	4.50%	4.50%
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment	$ 496,000,000				496,000,000
Unsecured Notes | 4.800% unsecured notes due 2044
Debt Instrument [Line Items]
Stated interest rate	4.80%	4.80%	4.80%
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment	$ 1,493,000,000				1,493,000,000
Unsecured Notes | Total 700 million pounds debt issuance
Debt Instrument [Line Items]
Face amount | £		£ 700,000,000
Unsecured Notes | 3.600% unsecured Pound sterling notes due 2025
Debt Instrument [Line Items]
Stated interest rate	3.60%	3.60%	3.60%
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment	$ 400,000,000				398,000,000
Unsecured Notes | Total 750 million euros debt issuance
Debt Instrument [Line Items]
Face amount | €			€ 750,000,000
Unsecured Notes | 2.125% unsecured Euro notes due 2026
Debt Instrument [Line Items]
Stated interest rate	2.125%	2.125%	2.125%
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment	$ 896,000,000				891,000,000
Unsecured Notes | Total $4.0 billion debt issuance
Debt Instrument [Line Items]
Face amount	$ 4,000,000,000
Unsecured Notes | 3.100% unsecured notes due 2022
Debt Instrument [Line Items]
Stated interest rate	3.10%	3.10%	3.10%
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment	$ 1,198,000,000				1,198,000,000
Unsecured Notes | 4.400% unsecured notes due 2042
Debt Instrument [Line Items]
Stated interest rate	4.40%	4.40%	4.40%
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment	$ 493,000,000				493,000,000
Commercial paper
Debt Instrument [Line Items]
Total short-term debt	1,662,000,000				1,517,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Total short-term debt	$ 1,617,000,000				$ 1,071,000,000