Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - Estimate of Fair Value [Member] - USD ($) $ in Millions	Apr. 29, 2016	Jan. 29, 2016	May. 01, 2015
Short-term Investments [Member]
Assets, Fair Value Disclosure
Available-for-sale securities, fair value	$ 174	$ 307	$ 95
Short-term Investments [Member] | Certificates Of Deposit [Member] | Fair Value (Level 1) [Member]
Assets, Fair Value Disclosure
Available-for-sale securities, fair value	97	56	16
Short-term Investments [Member] | Municipal Obligations [Member] | Fair Value (Level 2) [Member]
Assets, Fair Value Disclosure
Available-for-sale securities, fair value	34	38	20
Short-term Investments [Member] | Money Market Funds [Member] | Fair Value (Level 1) [Member]
Assets, Fair Value Disclosure
Available-for-sale securities, fair value	28	192	59
Short-term Investments [Member] | Municipal Floating Rate Obligations [Member] | Fair Value (Level 2) [Member]
Assets, Fair Value Disclosure
Available-for-sale securities, fair value	15	21	0
Other Current Assets [Member] | Fair Value (Level 2) [Member]
Assets, Fair Value Disclosure
Foreign exchange options, fair value	263	0	0
Long-term Investments [Member]
Assets, Fair Value Disclosure
Available-for-sale securities, fair value	400	222	384
Long-term Investments [Member] | Certificates Of Deposit [Member] | Fair Value (Level 1) [Member]
Assets, Fair Value Disclosure
Available-for-sale securities, fair value	4	5	5
Long-term Investments [Member] | Municipal Obligations [Member] | Fair Value (Level 2) [Member]
Assets, Fair Value Disclosure
Available-for-sale securities, fair value	4	5	2
Long-term Investments [Member] | Municipal Floating Rate Obligations [Member] | Fair Value (Level 2) [Member]
Assets, Fair Value Disclosure
Available-for-sale securities, fair value	$ 392	$ 212	$ 377