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Goodwill By Segment (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 29, 2015
Goodwill [Roll Forward]  
Goodwill Beginning of Period $ 21,832us-gaap_Goodwill
Goodwill, related to acquisitions 86us-gaap_GoodwillAcquiredDuringPeriod
Goodwill, related to divestitures (9)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
Currency translation/Other (564)us-gaap_GoodwillOtherChanges
Goodwill End of Period 21,345us-gaap_Goodwill
Consumer  
Goodwill [Roll Forward]  
Goodwill Beginning of Period 7,675us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_ConsumerMember
Goodwill, related to acquisitions 0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_ConsumerMember
Goodwill, related to divestitures (8)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_ConsumerMember
Currency translation/Other (393)us-gaap_GoodwillOtherChanges
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_ConsumerMember
Goodwill End of Period 7,274us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_ConsumerMember
Pharmaceutical  
Goodwill [Roll Forward]  
Goodwill Beginning of Period 2,626us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_PharmaceuticalMember
Goodwill, related to acquisitions 64us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_PharmaceuticalMember
Goodwill, related to divestitures (1)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_PharmaceuticalMember
Currency translation/Other (77)us-gaap_GoodwillOtherChanges
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_PharmaceuticalMember
Goodwill End of Period 2,612us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_PharmaceuticalMember
Medical Devices  
Goodwill [Roll Forward]  
Goodwill Beginning of Period 11,531us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_MedicalDevicesMember
Goodwill, related to acquisitions 22us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_MedicalDevicesMember
Goodwill, related to divestitures 0us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_MedicalDevicesMember
Currency translation/Other (94)us-gaap_GoodwillOtherChanges
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_MedicalDevicesMember		 [1]
Goodwill End of Period 11,459us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_MedicalDevicesMember
Cordis [Member] | Goodwill [Member]  
Goodwill [Line Items]  
Assets Held-for-sale, Other, Noncurrent $ 98us-gaap_AssetsHeldForSaleOtherNoncurrent
/ jnj_DivestitureByNameAxis
= jnj_CordisMember
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= us-gaap_GoodwillMember
[1] )Includes $98 million classified as held for sale, a component of other assets on the Consolidated Balance Sheet, related to the divestiture of Cordis which was pending as of March 29, 2015.