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Information on net borrowings (Details) - EUR (€) € in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | [1] | Dec. 31, 2015
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Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |  |  |
A. Cash and cash equivalents |  | € 10,836 | [1] | € 7,363 | [1] | € 5,674 | € 5,209
B. Held-for-trading financial assets |  | 6,552 | [2] | 6,012 |  |  |
C. Available-for-sale financial assets | [2] |  |  | 207 |  |  |
D. Liquidity (A+B+C) |  | 17,388 |  | 13,582 |  |  |
E. Financing receivables |  | 188 |  | 209 |  |  |
F. Short-term debt towards banks |  | 383 |  | 201 |  |  |
G. Long-term debt towards banks |  | 3,478 |  | 4,001 |  |  |
H. Bonds |  | 20,094 |  | 18,352 |  |  |
I. Short-term debt towards related parties |  | 661 |  | 164 |  |  |
L. Other short-term liabilities |  | 1,138 |  | 1,877 |  |  |
M. Other long-term liabilities |  | 111 |  | 112 |  |  |
N. Total borrowings (F+G+H+I+L+M) |  | 25,865 |  | 24,707 |  |  |
O. Net borrowings (N-D-E) |  | (11) |  | 10,916 |  |  |
Current Assets And Liabilities [Member] |  |  |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |  |  |
A. Cash and cash equivalents |  | 10,836 |  | 7,363 |  |  |
B. Held-for-trading financial assets |  | 6,552 |  | 6,012 |  |  |
C. Available-for-sale financial assets |  |  |  | 207 |  |  |
D. Liquidity (A+B+C) |  | 17,388 |  | 13,582 |  |  |
E. Financing receivables |  | 188 |  | 209 |  |  |
F. Short-term debt towards banks |  | 383 |  | 201 |  |  |
G. Long-term debt towards banks |  | 768 |  | 801 |  |  |
H. Bonds |  | 2,781 |  | 1,445 |  |  |
I. Short-term debt towards related parties |  | 661 |  | 164 |  |  |
L. Other short-term liabilities |  | 1,138 |  | 1,877 |  |  |
M. Other long-term liabilities |  | 52 |  | 40 |  |  |
N. Total borrowings (F+G+H+I+L+M) |  | 5,783 |  | 4,528 |  |  |
O. Net borrowings (N-D-E) |  | (11,793) |  | (9,263) |  |  |
Noncurrent Assets And Liabilities [Member] |  |  |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |  |  |
G. Long-term debt towards banks |  | 2,710 |  | 3,200 |  |  |
H. Bonds |  | 17,313 |  | 16,907 |  |  |
M. Other long-term liabilities |  | 59 |  | 72 |  |  |
N. Total borrowings (F+G+H+I+L+M) |  | 20,082 |  | 20,179 |  |  |
O. Net borrowings (N-D-E) |  | € 20,082 |  | € 20,179 |  |  |
[1] | Cash and cash equivalents as of December 31, 2018, include €19 million of cash and cash equivalents of consolidated subsidiaries held for sale that were reported in the item Assets held for sale in the balance sheet
[2] | Income or expense were recognized in the profit and loss account within “Finance income (expense)”.

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