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Guarantor Statements - Cash Flow Statement (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Cash Flow Statement [Line Items]      
Net cash flow from/(used in) operating activities € 7,292 € 7,047 € 7,330
Net cash flow from/(used in) investing activities (5,879) (3,188) (3,539)
Net cash flow from/(used in) financing activities (1,433) (3,073) (3,032)
Net increase/(decrease) in cash and cash equivalents (20) 786 759
Cash and cash equivalents at beginning of year 3,198 2,128 1,910
Effect of foreign exchange rates (9) 284 (541)
Cash and cash equivalents at end of year 3,169 3,198 2,128
Unilever Capital Corporation Subsidiary Issuer [Member]      
Disclosure Of Cash Flow Statement [Line Items]      
Net cash flow from/(used in) operating activities     (1)
Net cash flow from/(used in) investing activities (3,884) (1,053) (1,005)
Net cash flow from/(used in) financing activities 3,873 1,048 1,000
Net increase/(decrease) in cash and cash equivalents (11) (5) (6)
Effect of foreign exchange rates 11 5 6
Unilever Parent Entities [Member]      
Disclosure Of Cash Flow Statement [Line Items]      
Net cash flow from/(used in) operating activities 941 45 (699)
Net cash flow from/(used in) investing activities (7,123) (679) 231
Net cash flow from/(used in) financing activities 6,261 621 558
Net increase/(decrease) in cash and cash equivalents 79 (13) 90
Cash and cash equivalents at beginning of year 5 3 5
Effect of foreign exchange rates (61) 15 (91)
Cash and cash equivalents at end of year 23 5 3
Cash and cash equivalents at end of year, before rounding adjustment     4
Unilever United States Inc Subsidiary Guarantor [Member]      
Disclosure Of Cash Flow Statement [Line Items]      
Net cash flow from/(used in) operating activities (40) (177) (140)
Net cash flow from/(used in) investing activities (1,062) (783) (729)
Net cash flow from/(used in) financing activities 1,103 959 871
Net increase/(decrease) in cash and cash equivalents 1 (1) 2
Cash and cash equivalents at beginning of year (2) (1) (3)
Cash and cash equivalents at end of year (1) (2) (1)
Non Guarantor Subsidiaries [Member]      
Disclosure Of Cash Flow Statement [Line Items]      
Net cash flow from/(used in) operating activities 6,391 7,179 8,170
Net cash flow from/(used in) investing activities 5,136 (1,712) (2,955)
Net cash flow from/(used in) financing activities (11,616) (4,662) (4,542)
Net increase/(decrease) in cash and cash equivalents (89) 805 673
Cash and cash equivalents at beginning of year 3,195 2,126 1,908
Effect of foreign exchange rates 41 264 (456)
Cash and cash equivalents at end of year 3,147 3,195 2,126
Cash and cash equivalents at end of year, before rounding adjustment     2,125
Unilever Group [Member]      
Disclosure Of Cash Flow Statement [Line Items]      
Net cash flow from/(used in) operating activities 7,292 7,047 7,330
Net cash flow from/(used in) investing activities (5,879) (3,188) (3,539)
Net cash flow from/(used in) financing activities (1,433) (3,073) (3,032)
Net increase/(decrease) in cash and cash equivalents (20) 786 759
Cash and cash equivalents at beginning of year 3,198 2,128 1,910
Effect of foreign exchange rates (9) 284 (541)
Cash and cash equivalents at end of year 3,169 3,198 2,128
Eliminations [Member]      
Disclosure Of Cash Flow Statement [Line Items]      
Net cash flow from/(used in) investing activities 1,054 1,039 919
Net cash flow from/(used in) financing activities € (1,054) € (1,039) € (919)