Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets, Current [Abstract]
Cash and cash equivalents	$ 10,027	$ 2,113
Short-term marketable securities	101us-gaap_MarketableSecuritiesCurrent	19us-gaap_MarketableSecuritiesCurrent
Accounts receivable, net of allowances of $356 at December 31, 2014 and $252 at December 31, 2013	4,635us-gaap_AccountsReceivableNetCurrent	2,182us-gaap_AccountsReceivableNetCurrent
Inventories	1,386us-gaap_InventoryNet	1,697us-gaap_InventoryNet
Deferred tax assets	508us-gaap_DeferredTaxAssetsNetCurrent	331us-gaap_DeferredTaxAssetsNetCurrent
Prepaid taxes	391us-gaap_PrepaidTaxes	398us-gaap_PrepaidTaxes
Prepaid expenses	194us-gaap_PrepaidExpenseCurrent	166us-gaap_PrepaidExpenseCurrent
Other current assets	472us-gaap_OtherAssetsCurrent	91us-gaap_OtherAssetsCurrent
Total current assets	17,714us-gaap_AssetsCurrent	6,997us-gaap_AssetsCurrent
Assets, Noncurrent [Abstract]
Property, plant and equipment, net	1,674us-gaap_PropertyPlantAndEquipmentNet	1,166us-gaap_PropertyPlantAndEquipmentNet
Long-term portion of prepaid royalties	466us-gaap_PrepaidExpenseOtherNoncurrent	199us-gaap_PrepaidExpenseOtherNoncurrent
Long-term deferred tax assets	236us-gaap_DeferredTaxAssetsNetNoncurrent	190us-gaap_DeferredTaxAssetsNetNoncurrent
Long-term marketable securities	1,598us-gaap_MarketableSecuritiesNoncurrent	439us-gaap_MarketableSecuritiesNoncurrent
Intangible assets, net	11,073	11,900
Goodwill	1,172us-gaap_Goodwill	1,169us-gaap_Goodwill
Other long-term assets	731us-gaap_OtherAssetsNoncurrent	519us-gaap_OtherAssetsNoncurrent
Total assets	34,664us-gaap_Assets	22,579us-gaap_Assets
Current liabilities [Abstract]
Accounts payable	955us-gaap_AccountsPayableCurrent	1,256us-gaap_AccountsPayableCurrent
Accrued government and other rebates	2,316gild_AccruedGovernmentRebates	1,018gild_AccruedGovernmentRebates
Accrued compensation and employee benefits	316	243
Income taxes payable	105us-gaap_AccruedIncomeTaxesCurrent	11us-gaap_AccruedIncomeTaxesCurrent
Other accrued liabilities	1,452us-gaap_OtherAccruedLiabilitiesCurrent	1,071us-gaap_OtherAccruedLiabilitiesCurrent
Deferred revenues	134us-gaap_DeferredRevenueCurrent	111us-gaap_DeferredRevenueCurrent
Current portion of long-term debt and other obligations, net	483us-gaap_DebtCurrent	2,697us-gaap_DebtCurrent
Total current liabilities	5,761us-gaap_LiabilitiesCurrent	6,407us-gaap_LiabilitiesCurrent
Liabilities, Noncurrent [Abstract]
Long-term Debt, net	11,921us-gaap_LongTermDebtNoncurrent	3,939us-gaap_LongTermDebtNoncurrent
Long-term income taxes payable	562us-gaap_AccruedIncomeTaxesNoncurrent	162us-gaap_AccruedIncomeTaxesNoncurrent
Long-term deferred tax liabilities	51	83
Other long-term obligations	535us-gaap_OtherLiabilitiesNoncurrent	179us-gaap_OtherLiabilitiesNoncurrent
Commitments and contingencies (Note 11)
Temporary Equity [Abstract]
Equity component of currently redeemable convertible notes (Note 10)	15	64
Stockholders' Equity [Abstract]
Preferred stock, par value $0.001 per share; 5 shares authorized; none outstanding	0us-gaap_PreferredStockValue	0us-gaap_PreferredStockValue
Common stock, par value $0.001 per share; shares authorized of 5,600 at December 31, 2014 and December 31, 2013; shares issued and outstanding of 1,499 at December 31, 2014 and 1,534 at December 31, 2013	2us-gaap_CommonStockValue	2us-gaap_CommonStockValue
Additional paid-in capital	2,391us-gaap_AdditionalPaidInCapital	5,386us-gaap_AdditionalPaidInCapital
Accumulated other comprehensive income (loss)	301	(124)
Retained earnings	12,732	6,106
Total Gilead stockholders’ equity	15,426us-gaap_StockholdersEquity	11,370us-gaap_StockholdersEquity
Noncontrolling interest	393us-gaap_MinorityInterest	375us-gaap_MinorityInterest
Total stockholders’ equity	15,819	11,745
Total liabilities and stockholders’ equity	$ 34,664	$ 22,579

Estimates of amounts that will be owed to the government for product sales qualifying for rebates.

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