Short-term Borrowings and Long-term Debt (Schedule of Debt Repayments) (Details) € in Millions, ¥ in Millions, $ in Millions	12 Months Ended
	Jan. 31, 2023 USD ($)	Jan. 31, 2022 USD ($)	Jan. 31, 2021 USD ($)	Dec. 15, 2022 USD ($)	Jul. 15, 2022 JPY (¥)	Apr. 08, 2022 EUR (€)	Sep. 23, 2021 USD ($)	Jun. 23, 2021 USD ($)	Apr. 15, 2021 USD ($)
Debt Instrument [Line Items]
Repayment, Current Maturities		$ 3,010
Repayment, Excluding Current Maturities		10,000
Repayments of Long-term Debt	$ 2,689	13,010	$ 5,382
1.900% Debt, Due 2022 | Unsecured debt
Debt Instrument [Line Items]
Principal Amount | €						€ 850
Interest Rate						1.90%
Repayments of Long-term Debt	927
0.183% Debt, Due 2022 | Unsecured debt
Debt Instrument [Line Items]
Principal Amount | ¥					¥ 70,000
Interest Rate					0.183%
Repayments of Long-term Debt	512
2.350% Debt, Due 2022 | Unsecured debt
Debt Instrument [Line Items]
Principal Amount				$ 1,250
Interest Rate				2.35%
Repayments of Long-term Debt	$ 1,250
4.250% Debt, Due 2021
Debt Instrument [Line Items]
Principal Amount									$ 510
Interest Rate									4.25%
Repayment, Current Maturities		510
Floating Rate Debt, Due 2021
Debt Instrument [Line Items]
Principal Amount								$ 750
Repayment, Current Maturities		750
3.125% Debt, Due 2021
Debt Instrument [Line Items]
Principal Amount								$ 1,750
Interest Rate								3.125%
Repayment, Current Maturities		1,750
3.400% Debt, Due 2023
Debt Instrument [Line Items]
Principal Amount							$ 2,750
Interest Rate							3.40%
Repayment, Excluding Current Maturities		470
6.750% Debt, Due 2023
Debt Instrument [Line Items]
Principal Amount							$ 152
Interest Rate							6.75%
Repayment, Excluding Current Maturities		2
2.850% Debt, Due 2024
Debt Instrument [Line Items]
Principal Amount							$ 1,500
Interest Rate							2.85%
Repayment, Excluding Current Maturities		510
2.650% Debt, Due 2024
Debt Instrument [Line Items]
Principal Amount							$ 1,000
Interest Rate							2.65%
Repayment, Excluding Current Maturities		370
3.550% Debt, Due 2025
Debt Instrument [Line Items]
Principal Amount							$ 1,500
Interest Rate							3.55%
Repayment, Excluding Current Maturities		625
3.050% Debt, Due 2026
Debt Instrument [Line Items]
Principal Amount							$ 1,250
Interest Rate							3.05%
Repayment, Excluding Current Maturities		451
5.875% Debt, Due 2027
Debt Instrument [Line Items]
Principal Amount							$ 483
Interest Rate							5.875%
Repayment, Excluding Current Maturities		110
3.700% Debt, Due 2028
Debt Instrument [Line Items]
Principal Amount							$ 2,750
Interest Rate							3.70%
Repayment, Excluding Current Maturities		1,271
3.250% Debt, Due 2029
Debt Instrument [Line Items]
Principal Amount							$ 1,250
Interest Rate							3.25%
Repayment, Excluding Current Maturities		517
2.375% Debt, Due 2029
Debt Instrument [Line Items]
Principal Amount							$ 500
Interest Rate							2.375%
Repayment, Excluding Current Maturities		181
7.550% Debt, Due 2030
Debt Instrument [Line Items]
Principal Amount							$ 588
Interest Rate							7.55%
Repayment, Excluding Current Maturities		119
5.250% Debt, Due 2035
Debt Instrument [Line Items]
Principal Amount							$ 1,968
Interest Rate							5.25%
Repayment, Excluding Current Maturities		635
6.500% Debt, Due 2037
Debt Instrument [Line Items]
Principal Amount							$ 1,300
Interest Rate							6.50%
Repayment, Excluding Current Maturities		262
6.200% Debt, Due 2038
Debt Instrument [Line Items]
Principal Amount							$ 919
Interest Rate							6.20%
Repayment, Excluding Current Maturities		116
3.950% Debt, Due 2038
Debt Instrument [Line Items]
Principal Amount							$ 1,500
Interest Rate							3.95%
Repayment, Excluding Current Maturities		925
5.625% Debt, Due 2040
Debt Instrument [Line Items]
Principal Amount							$ 751
Interest Rate							5.625%
Repayment, Excluding Current Maturities		142
4.875% Debt, Due 2040
Debt Instrument [Line Items]
Principal Amount							$ 378
Interest Rate							4.875%
Repayment, Excluding Current Maturities		101
5.000% Debt, Due 2040
Debt Instrument [Line Items]
Principal Amount							$ 519
Interest Rate							5.00%
Repayment, Excluding Current Maturities		125
5.625% Debt, Due 2041
Debt Instrument [Line Items]
Principal Amount							$ 918
Interest Rate							5.625%
Repayment, Excluding Current Maturities		305
4.000% Debt, Due 2043
Debt Instrument [Line Items]
Principal Amount							$ 709
Interest Rate							4.00%
Repayment, Excluding Current Maturities		296
4.750% Debt, Due 2043
Debt Instrument [Line Items]
Principal Amount							$ 269
Interest Rate							4.75%
Repayment, Excluding Current Maturities		38
4.300% Debt, Due 2044
Debt Instrument [Line Items]
Principal Amount							$ 502
Interest Rate							4.30%
Repayment, Excluding Current Maturities		172
3.625% Debt, Due 2047
Debt Instrument [Line Items]
Principal Amount							$ 1,000
Interest Rate							3.625%
Repayment, Excluding Current Maturities		566
4.050% Debt, Due 2048
Debt Instrument [Line Items]
Principal Amount							$ 3,000
Interest Rate							4.05%
Repayment, Excluding Current Maturities		1,317
2.950% Debt, Due 2049
Debt Instrument [Line Items]
Principal Amount							$ 1,000
Interest Rate							2.95%
Repayment, Excluding Current Maturities		$ 371