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Segments of Business and Geographic Areas (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 29, 2015
Mar. 30, 2014
Sales by segment of business    
Sales $ 17,374us-gaap_SalesRevenueGoodsNet $ 18,115us-gaap_SalesRevenueGoodsNet
Percentage Change In Sales By Segment Of Business (4.10%)jnj_PercentageChangeInSalesBySegmentOfBusiness  
United States    
Sales by segment of business    
Sales 8,692us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= country_US
8,204us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= country_US
Percentage Change In Sales By Segment Of Business 5.90%jnj_PercentageChangeInSalesBySegmentOfBusiness
/ us-gaap_StatementGeographicalAxis
= country_US
 
International    
Sales by segment of business    
Sales 8,682us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= jnj_InternationalMember
9,911us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= jnj_InternationalMember
Percentage Change In Sales By Segment Of Business (12.40%)jnj_PercentageChangeInSalesBySegmentOfBusiness
/ us-gaap_StatementGeographicalAxis
= jnj_InternationalMember
 
Consumer    
Sales by segment of business    
Sales 3,390us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_ConsumerMember
3,557us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_ConsumerMember
Percentage Change In Sales By Segment Of Business (4.70%)jnj_PercentageChangeInSalesBySegmentOfBusiness
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_ConsumerMember
 
Consumer | United States    
Sales by segment of business    
Sales 1,359us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_ConsumerMember
/ us-gaap_StatementGeographicalAxis
= country_US
1,309us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_ConsumerMember
/ us-gaap_StatementGeographicalAxis
= country_US
Percentage Change In Sales By Segment Of Business 3.80%jnj_PercentageChangeInSalesBySegmentOfBusiness
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_ConsumerMember
/ us-gaap_StatementGeographicalAxis
= country_US
 
Consumer | International    
Sales by segment of business    
Sales 2,031us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_ConsumerMember
/ us-gaap_StatementGeographicalAxis
= jnj_InternationalMember
2,248us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_ConsumerMember
/ us-gaap_StatementGeographicalAxis
= jnj_InternationalMember
Percentage Change In Sales By Segment Of Business (9.70%)jnj_PercentageChangeInSalesBySegmentOfBusiness
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_ConsumerMember
/ us-gaap_StatementGeographicalAxis
= jnj_InternationalMember
 
Pharmaceutical    
Sales by segment of business    
Sales 7,726us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_PharmaceuticalMember
7,498us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_PharmaceuticalMember
Percentage Change In Sales By Segment Of Business 3.00%jnj_PercentageChangeInSalesBySegmentOfBusiness
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_PharmaceuticalMember
 
Pharmaceutical | United States    
Sales by segment of business    
Sales 4,371us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_PharmaceuticalMember
/ us-gaap_StatementGeographicalAxis
= country_US
3,740us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_PharmaceuticalMember
/ us-gaap_StatementGeographicalAxis
= country_US
Percentage Change In Sales By Segment Of Business 16.90%jnj_PercentageChangeInSalesBySegmentOfBusiness
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_PharmaceuticalMember
/ us-gaap_StatementGeographicalAxis
= country_US
 
Pharmaceutical | International    
Sales by segment of business    
Sales 3,355us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_PharmaceuticalMember
/ us-gaap_StatementGeographicalAxis
= jnj_InternationalMember
3,758us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_PharmaceuticalMember
/ us-gaap_StatementGeographicalAxis
= jnj_InternationalMember
Percentage Change In Sales By Segment Of Business (10.70%)jnj_PercentageChangeInSalesBySegmentOfBusiness
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_PharmaceuticalMember
/ us-gaap_StatementGeographicalAxis
= jnj_InternationalMember
 
Medical Devices    
Sales by segment of business    
Sales 6,258us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_MedicalDevicesMember
7,060us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_MedicalDevicesMember
Percentage Change In Sales By Segment Of Business (11.40%)jnj_PercentageChangeInSalesBySegmentOfBusiness
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_MedicalDevicesMember
 
Medical Devices | United States    
Sales by segment of business    
Sales 2,962us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_MedicalDevicesMember
/ us-gaap_StatementGeographicalAxis
= country_US
3,155us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_MedicalDevicesMember
/ us-gaap_StatementGeographicalAxis
= country_US
Percentage Change In Sales By Segment Of Business (6.10%)jnj_PercentageChangeInSalesBySegmentOfBusiness
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_MedicalDevicesMember
/ us-gaap_StatementGeographicalAxis
= country_US
 
Medical Devices | International    
Sales by segment of business    
Sales $ 3,296us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_MedicalDevicesMember
/ us-gaap_StatementGeographicalAxis
= jnj_InternationalMember
$ 3,905us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_MedicalDevicesMember
/ us-gaap_StatementGeographicalAxis
= jnj_InternationalMember
Percentage Change In Sales By Segment Of Business (15.60%)jnj_PercentageChangeInSalesBySegmentOfBusiness
/ us-gaap_StatementBusinessSegmentsAxis
= jnj_MedicalDevicesMember
/ us-gaap_StatementGeographicalAxis
= jnj_InternationalMember