Debt - Short and Long-Term Debt (Details)	Nov. 30, 2021 USD ($)	Nov. 30, 2021 GBP (£)	Nov. 30, 2021 EUR (€)	Nov. 17, 2021 USD ($)	Oct. 29, 2021 USD ($)	Sep. 18, 2021 USD ($)	Aug. 31, 2021 USD ($)
Debt Instrument [Line Items]
Total short-term debt	$ 2,647,000,000						$ 1,305,000,000
Total long-term debt, less current portion	11,199,000,000						7,675,000,000
Shields Health Solutions Parent, LLC
Debt Instrument [Line Items]
Long-term debt assumed					$ 447,000,000
Credit facilities
Debt Instrument [Line Items]
Long-term debt	2,990,000,000						0
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%			3.30%
Total short-term debt	$ 0						1,250,000,000
Debt redeemed						$ 1,250,000,000
3.100% unsecured notes due 2022
Debt Instrument [Line Items]
Total short-term debt	731,000,000						0
Other
Debt Instrument [Line Items]
Total short-term debt	242,000,000						56,000,000
Unsecured Notes
Debt Instrument [Line Items]
Other	477,000,000						29,000,000
Total long-term debt, less current portion	$ 11,199,000,000						7,675,000,000
Unsecured Notes | 3.100% unsecured notes due 2022
Debt Instrument [Line Items]
Stated interest rate	3.10%	3.10%	3.10%
Long-term debt	$ 0						731,000,000
Unsecured Notes | $850 million note issuance
Debt Instrument [Line Items]
Face amount	$ 850,000,000
Unsecured Notes | 0.9500% Notes Payable, Due 2023
Debt Instrument [Line Items]
Face amount				$ 850,000,000
Stated interest rate	0.95%	0.95%	0.95%	0.95%
Long-term debt	$ 848,000,000						0
Unsecured Notes | Total $1.5 billion note issuance
Debt Instrument [Line Items]
Face amount	$ 1,500,000,000
Unsecured Notes | 3.200% unsecured notes due 2030
Debt Instrument [Line Items]
Stated interest rate	3.20%	3.20%	3.20%
Long-term debt	$ 497,000,000						497,000,000
Unsecured Notes | 4.100% unsecured notes due 2050
Debt Instrument [Line Items]
Stated interest rate	4.10%	4.10%	4.10%
Long-term debt	$ 792,000,000						792,000,000
Unsecured Notes | Total $6 billion note 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%
Long-term debt	$ 1,442,000,000						1,442,000,000
Unsecured Notes | 4.650% unsecured notes due 2046
Debt Instrument [Line Items]
Stated interest rate	4.65%	4.65%	4.65%
Long-term debt	$ 318,000,000						318,000,000
Unsecured Notes | Total $8 billion note 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%
Long-term debt	$ 1,154,000,000						1,154,000,000
Unsecured Notes | 4.500% unsecured notes due 2034
Debt Instrument [Line Items]
Stated interest rate	4.50%	4.50%	4.50%
Long-term debt	$ 301,000,000						301,000,000
Unsecured Notes | 4.800% unsecured notes due 2044
Debt Instrument [Line Items]
Stated interest rate	4.80%	4.80%	4.80%
Long-term debt	$ 868,000,000						868,000,000
Unsecured Notes | Total £700 million note 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%
Long-term debt	$ 403,000,000						408,000,000
Unsecured Notes | Total €750 million note 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%
Long-term debt	$ 846,000,000						873,000,000
Unsecured Notes | Total $4 billion note issuance
Debt Instrument [Line Items]
Face amount	$ 4,000,000,000
Unsecured Notes | 4.400% unsecured notes due 2042
Debt Instrument [Line Items]
Stated interest rate	4.40%	4.40%	4.40%
Long-term debt	$ 263,000,000						263,000,000
Commercial paper
Debt Instrument [Line Items]
Total short-term debt	875,000,000						0
Credit facilities
Debt Instrument [Line Items]
Total short-term debt	$ 799,000,000						$ 0