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Fair Value Measurements - Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($) $ in Millions	Jul. 31, 2020	Jan. 31, 2020	Aug. 02, 2019
Assets, Fair Value Disclosure
Investments	$ 761
Fair Value, Measurements, Recurring \| Estimate of Fair Value \| Short-term Investments
Assets, Fair Value Disclosure
Investments	435	$ 160	$ 275
Fair Value, Measurements, Recurring \| Estimate of Fair Value \| Short-term Investments \| Certificates of deposit \| Fair Value (Level 1)
Assets, Fair Value Disclosure
Investments	175	0	0
Fair Value, Measurements, Recurring \| Estimate of Fair Value \| Short-term Investments \| U.S. Treasury notes \| Fair Value (Level 1)
Assets, Fair Value Disclosure
Investments	104	13	0
Fair Value, Measurements, Recurring \| Estimate of Fair Value \| Short-term Investments \| Money market funds \| Fair Value (Level 1)
Assets, Fair Value Disclosure
Investments	98	105	241
Fair Value, Measurements, Recurring \| Estimate of Fair Value \| Short-term Investments \| Corporate debt securities \| Fair Value (Level 2)
Assets, Fair Value Disclosure
Investments	35	23	12
Fair Value, Measurements, Recurring \| Estimate of Fair Value \| Short-term Investments \| Agency securities \| Fair Value (Level 2)
Assets, Fair Value Disclosure
Investments	23	19	22
Fair Value, Measurements, Recurring \| Estimate of Fair Value \| Long-term Investments
Assets, Fair Value Disclosure
Investments	326	372	179
Fair Value, Measurements, Recurring \| Estimate of Fair Value \| Long-term Investments \| U.S. Treasury notes \| Fair Value (Level 1)
Assets, Fair Value Disclosure
Investments	250	280	67
Fair Value, Measurements, Recurring \| Estimate of Fair Value \| Long-term Investments \| Corporate debt securities \| Fair Value (Level 2)
Assets, Fair Value Disclosure
Investments	61	62	75
Fair Value, Measurements, Recurring \| Estimate of Fair Value \| Long-term Investments \| Agency securities \| Fair Value (Level 2)
Assets, Fair Value Disclosure
Investments	15	30	37
Fair Value, Measurements, Recurring \| Estimate of Fair Value \| Other current liabilities
Liabilities, Fair Value Disclosure
Other current liabilities	20	11	0
Fair Value, Measurements, Recurring \| Estimate of Fair Value \| Other current liabilities \| Forward interest rate swaps \| Fair Value (Level 2)
Liabilities, Fair Value Disclosure
Other current liabilities	20	11	0
Fair Value, Measurements, Recurring \| Estimate of Fair Value \| Other noncurrent liabilities
Liabilities, Fair Value Disclosure
Total other liabilities	21	0	0
Fair Value, Measurements, Recurring \| Estimate of Fair Value \| Other noncurrent liabilities \| Forward interest rate swaps \| Fair Value (Level 2)
Liabilities, Fair Value Disclosure
Other liabilities	$ 21	$ 0	$ 0