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

Stockholders’ Equity - Additional Information (Details) - Stock Repurchase Program July 2016 - shares shares in Billions	Jul. 21, 2017	Jul. 31, 2016
Equity, Class of Treasury Stock [Line Items]
Number of shares authorized		2.5
Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Number of shares authorized	3.0