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Long-term debt and current portion of long-term debt (Details 6) - EUR (€) € in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |  |  |  |
A. Cash and cash equivalents |  | € 7,363 | € 5,674 | € 5,209 | € 6,614
B. Held-for-trading financial assets | [1] | 6,012 | 6,166 |  |
C. Available-for-sale financial assets | [2] | 207 | 238 |  |
D. Liquidity (A+B+C) |  | 13,582 | 12,078 |  |
E. Financing receivables |  | 209 | 385 |  |
F. Short-term debt towards banks |  | 201 | 155 |  |
G. Long-term debt towards banks |  | 4,001 | 4,286 |  |
H. Bonds |  | 18,352 | 19,386 |  |
I. Short-term debt towards related parties |  | 164 | 191 |  |
L. Other short-term liabilities |  | 1,877 | 3,050 |  |
M. Other long-term liabilities |  | 112 | 171 |  |
N. Total borrowings (F+G+H+I+L+M) |  | 24,707 | 27,239 |  |
O. Net borrowings (N-D-E) |  | 10,916 | 14,776 |  |
Current Assets And Liabilities [Member] |  |  |  |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |  |  |  |
A. Cash and cash equivalents |  | 7,363 | 5,674 |  |
B. Held-for-trading financial assets |  | 6,012 | 6,166 |  |
C. Available-for-sale financial assets |  | 207 | 238 |  |
D. Liquidity (A+B+C) |  | 13,582 | 12,078 |  |
E. Financing receivables |  | 209 | 385 |  |
F. Short-term debt towards banks |  | 201 | 155 |  |
G. Long-term debt towards banks |  | 801 | 272 |  |
H. Bonds |  | 1,445 | 2,959 |  |
I. Short-term debt towards related parties |  | 164 | 191 |  |
L. Other short-term liabilities |  | 1,877 | 3,050 |  |
M. Other long-term liabilities |  | 40 | 48 |  |
N. Total borrowings (F+G+H+I+L+M) |  | 4,528 | 6,675 |  |
O. Net borrowings (N-D-E) |  | (9,263) | (5,788) |  |
Non-current Assets And Liabilities [Member] |  |  |  |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |  |  |  |
G. Long-term debt towards banks |  | 3,200 | 4,014 |  |
H. Bonds |  | 16,907 | 16,427 |  |
M. Other long-term liabilities |  | 72 | 123 |  |
N. Total borrowings (F+G+H+I+L+M) |  | 20,179 | 20,564 |  |
O. Net borrowings (N-D-E) |  | € 20,179 | € 20,564 |  |
[1] | Income or expense were recognized in the profit and loss account within &#147;Finance income (expense)&#148;.
[2] | In the profit and loss account, economic effects were essentially recognized as expense within &#147;Purchase, services and other&#148; for &euro;933 million (expense for &euro;840 million in 2016) (impairments net of reversal) and as expense for &euro;25 million within &#147;Finance income (expense)&#148; (expense for &euro;276 million in 2016) (exchange rate differences at year-end and amortized cost).

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