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Treasury Risk Management - Summary of Maturity Analysis for Non-derivative and Derivative Financial Liabilities (Detail) - EUR (€) € in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Preference shares |  | € (92)
Bank loans and overdrafts | € (1,005) | (1,156)
Bonds and other loans | (25,718) | (17,953)
Finance lease creditors | (206) | (220)
Other financial liabilities | (177) |
Trade payables, accruals and other liabilities | (13,076) | (13,476)
Deferred consideration | (616) | (789)
Total non-derivative financial liabilities | (40,798) | (33,686)
Derivative financial liabilities | (364) | (343)
Derivative & Non-derivative financial liabilities | (41,162) | (34,029)
Interest rate derivatives [Member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Derivative contracts - receipts | 3,325 | 476
Derivative contracts - payments | (3,347) | (499)
Foreign exchange derivatives [member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Derivative contracts - receipts | 24,935 | 9,263
Derivative contracts - payments | (25,258) | (9,580)
Commodity Derivatives [member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Derivative contracts - payments | (19) | (3)
Net Carrying Amount [Member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Preference shares |  | (68)
Bank loans and overdrafts | (992) | (1,146)
Bonds and other loans | (22,709) | (15,053)
Finance lease creditors | (131) | (143)
Other financial liabilities | (177) |
Trade payables, accruals and other liabilities | (13,076) | (13,476)
Deferred consideration | (511) | (594)
Total non-derivative financial liabilities | (37,596) | (30,480)
Derivative financial liabilities | (534) | (331)
Derivative & Non-derivative financial liabilities | (38,130) | (30,811)
Within 1 year [Member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Preference shares |  | (4)
Bank loans and overdrafts | (522) | (909)
Bonds and other loans | (7,558) | (4,700)
Finance lease creditors | (20) | (24)
Other financial liabilities | (177) |
Trade payables, accruals and other liabilities | (12,861) | (13,252)
Deferred consideration | (26) | (151)
Total non-derivative financial liabilities | (21,164) | (19,040)
Derivative financial liabilities | (312) | (334)
Derivative & Non-derivative financial liabilities | (21,476) | (19,374)
Within 1 year [Member] | Interest rate derivatives [Member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Derivative contracts - receipts | 349 | 56
Derivative contracts - payments | (319) | (70)
Within 1 year [Member] | Foreign exchange derivatives [member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Derivative contracts - receipts | 24,935 | 9,263
Derivative contracts - payments | (25,258) | (9,580)
Within 1 year [Member] | Commodity Derivatives [member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Derivative contracts - payments | (19) | (3)
Due between 1 and 2 years [Member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Preference shares |  | (4)
Bank loans and overdrafts | (221) | (4)
Bonds and other loans | (1,577) | (1,335)
Finance lease creditors | (18) | (18)
Trade payables, accruals and other liabilities | (215) | (224)
Deferred consideration | (36) | (114)
Total non-derivative financial liabilities | (2,067) | (1,699)
Derivative financial liabilities | 45 | (9)
Derivative & Non-derivative financial liabilities | (2,022) | (1,708)
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 | 64 | 420
Derivative contracts - payments | (19) | (429)
Due between 2 and 3 years [Member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Preference shares |  | (4)
Bank loans and overdrafts | (1) | (243)
Bonds and other loans | (2,546) | (1,669)
Finance lease creditors | (17) | (18)
Deferred consideration | (27) | (24)
Total non-derivative financial liabilities | (2,591) | (1,958)
Derivative financial liabilities | (26) |
Derivative & Non-derivative financial liabilities | (2,617) | (1,958)
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 | 727 |
Derivative contracts - payments | (753) |
Due between 3 and 4 years [Member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Preference shares |  | (4)
Bank loans and overdrafts | (1) |
Bonds and other loans | (2,026) | (1,882)
Finance lease creditors | (16) | (17)
Deferred consideration | (515) |
Total non-derivative financial liabilities | (2,558) | (1,903)
Derivative financial liabilities | 32 |
Derivative & Non-derivative financial liabilities | (2,526) | (1,903)
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 | 51 |
Derivative contracts - payments | (19) |
Due between 4 and 5 years [Member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Preference shares |  | (4)
Bank loans and overdrafts | (260) |
Bonds and other loans | (2,058) | (1,634)
Finance lease creditors | (17) | (16)
Deferred consideration | (3) | (490)
Total non-derivative financial liabilities | (2,338) | (2,144)
Derivative financial liabilities | (43) |
Derivative & Non-derivative financial liabilities | (2,381) | (2,144)
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 | 754 |
Derivative contracts - payments | (797) |
Later than 5 years [Member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [Line Items] |  |
Preference shares |  | (72)
Bonds and other loans | (9,953) | (6,733)
Finance lease creditors | (118) | (127)
Deferred consideration | (9) | (10)
Total non-derivative financial liabilities | (10,080) | (6,942)
Derivative financial liabilities | (60) |
Derivative & Non-derivative financial liabilities | (10,140) | € (6,942)
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 | 1,380 |
Derivative contracts - payments | € (1,440) |

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