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Treasury Risk Management - Summary of Maturity Analysis for Non-derivative and Derivative Financial Liabilities (Detail) - EUR (€) € in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Preference shares |  | € 0
Bank loans and overdrafts | € (820) | (1,005)
Bonds and other loans | (27,331) | (25,718)
Finance lease creditors | (187) | (206)
Other financial liabilities | (150) | (177)
Trade payables, accruals and other liabilities | (14,118) | (13,076)
Deferred consideration | (214) | (616)
Total non-derivative financial liabilities | (42,820) | (40,798)
Derivative financial liabilities | (216) | (364)
Derivative & Non-derivative financial liabilities | (43,036) | (41,162)
Interest rate derivatives [member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Derivative contracts - receipts | 3,221 | 3,325
Derivative contracts - payments | (3,154) | (3,347)
Foreign exchange derivatives [member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Derivative contracts - receipts | 17,108 | 24,935
Derivative contracts - payments | (17,317) | (25,258)
Commodity Derivatives [member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Derivative contracts - payments | (74) | (19)
Net carrying amount [Member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Preference shares |  | 0
Bank loans and overdrafts | (814) | (992)
Bonds and other loans | (23,391) | (22,709)
Finance lease creditors | (128) | (131)
Other financial liabilities | (150) | (177)
Trade payables, accruals and other liabilities | (14,118) | (13,076)
Deferred consideration | (187) | (511)
Total non-derivative financial liabilities | (38,788) | (37,596)
Derivative financial liabilities | (542) | (534)
Derivative & Non-derivative financial liabilities | (39,330) | (38,130)
Within 1 year [Member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Preference shares |  | 0
Bank loans and overdrafts | (529) | (522)
Bonds and other loans | (2,888) | (7,558)
Finance lease creditors | (20) | (20)
Other financial liabilities | (149) | (177)
Trade payables, accruals and other liabilities | (13,945) | (12,861)
Deferred consideration | (14) | (26)
Total non-derivative financial liabilities | (17,545) | (21,164)
Derivative financial liabilities | (239) | (312)
Derivative & Non-derivative financial liabilities | (17,784) | (21,476)
Within 1 year [Member] | Interest rate derivatives [member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Derivative contracts - receipts | 67 | 349
Derivative contracts - payments | (23) | (319)
Within 1 year [Member] | Foreign exchange derivatives [member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Derivative contracts - receipts | 17,108 | 24,935
Derivative contracts - payments | (17,317) | (25,258)
Within 1 year [Member] | Commodity Derivatives [member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Derivative contracts - payments | (74) | (19)
Due between 1 and 2 years [Member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Preference shares |  | 0
Bank loans and overdrafts | (12) | (221)
Bonds and other loans | (2,748) | (1,577)
Finance lease creditors | (19) | (18)
Other financial liabilities | (1) |
Trade payables, accruals and other liabilities | (140) | (215)
Deferred consideration | (79) | (36)
Total non-derivative financial liabilities | (2,999) | (2,067)
Derivative financial liabilities | 4 | 45
Derivative & Non-derivative financial liabilities | (2,995) | (2,022)
Due between 1 and 2 years [Member] | Interest rate derivatives [member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Derivative contracts - receipts | 760 | 64
Derivative contracts - payments | (756) | (19)
Due between 2 and 3 years [Member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Preference shares |  | 0
Bank loans and overdrafts | (1) | (1)
Bonds and other loans | (2,572) | (2,546)
Finance lease creditors | (18) | (17)
Trade payables, accruals and other liabilities | (10) |
Deferred consideration | (70) | (27)
Total non-derivative financial liabilities | (2,671) | (2,591)
Derivative financial liabilities | 25 | (26)
Derivative & Non-derivative financial liabilities | (2,646) | (2,617)
Due between 2 and 3 years [Member] | Interest rate derivatives [member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Derivative contracts - receipts | 163 | 727
Derivative contracts - payments | (138) | (753)
Due between 3 and 4 years [Member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Preference shares |  | 0
Bank loans and overdrafts | (278) | (1)
Bonds and other loans | (2,646) | (2,026)
Finance lease creditors | (17) | (16)
Trade payables, accruals and other liabilities | (5) |
Deferred consideration | (6) | (515)
Total non-derivative financial liabilities | (2,952) | (2,558)
Derivative financial liabilities | (9) | 32
Derivative & Non-derivative financial liabilities | (2,961) | (2,526)
Due between 3 and 4 years [Member] | Interest rate derivatives [member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Derivative contracts - receipts | 788 | 51
Derivative contracts - payments | (797) | (19)
Due between 4 and 5 years [Member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Preference shares |  | 0
Bank loans and overdrafts |  | (260)
Bonds and other loans | (2,387) | (2,058)
Finance lease creditors | (17) | (17)
Trade payables, accruals and other liabilities | (4) |
Deferred consideration |  | (3)
Total non-derivative financial liabilities | (2,408) | (2,338)
Derivative financial liabilities | 20 | (43)
Derivative & Non-derivative financial liabilities | (2,388) | (2,381)
Due between 4 and 5 years [Member] | Interest rate derivatives [member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Derivative contracts - receipts | 37 | 754
Derivative contracts - payments | (17) | (797)
Later than 5 years [Member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Preference shares |  | 0
Bonds and other loans | (14,090) | (9,953)
Finance lease creditors | (96) | (118)
Trade payables, accruals and other liabilities | (14) |
Deferred consideration | (45) | (9)
Total non-derivative financial liabilities | (14,245) | (10,080)
Derivative financial liabilities | (17) | (60)
Derivative & Non-derivative financial liabilities | (14,262) | (10,140)
Later than 5 years [Member] | Interest rate derivatives [member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Derivative contracts - receipts | 1,406 | 1,380
Derivative contracts - payments | € (1,423) | € (1,440)

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