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Other financial assets - Financing receivables net of allowance for doubtful accounts (Details) - Accumulated impairment - Financing receivables held for operating and non operating purpose - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Other financial assets |  |
Financial assets at beginning of period | € 430 | € 730
Additions | 11 | 279
Deductions | (88) | (596)
Currency translation differences | 7 | 17
Other changes | 19 |
Financial assets at end of period | € 379 | € 430

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