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Financial Instruments (Schedule of Other Investments Not Readily Marketable) (Details) (Level 3, USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Other Investments Not Readily Marketable [Roll Forward]  
Balance at January 1, 2015 $ 90us-gaap_OtherInvestmentNotReadilyMarketableFairValue
Purchases of securities (1) 908goog_OtherInvestmentNotReadilyMarketablePurchasesDuringPeriod
Balance at March 31, 2015 998us-gaap_OtherInvestmentNotReadilyMarketableFairValue
SpaceX  
Other Investments Not Readily Marketable [Roll Forward]  
Purchases of securities (1) $ 900goog_OtherInvestmentNotReadilyMarketablePurchasesDuringPeriod
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= goog_SpaceXMember