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Name:	us-gaap_EquityClassOfTreasuryStockLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Stockholders' Equity - Repurchase Authorizations (Details) - USD ($)	Feb. 29, 2016	Jan. 31, 2015
2015 Stock Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Authorized amount		$ 15,000,000,000.0
2016 Stock Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Authorized amount	$ 12,000,000,000.0