14 Other liabilities

millions of €
  Dec. 31, 2017 Of which: current Dec. 31, 2016 Of which: current
Early retirement 1,283 447 1,856 573
Deferred revenue 2,321 1,759 2,665 2,080
Liabilities from straight-line leases 2,098 2,334
Liabilities from other taxes 1,133 1,133 1,092 1,092
Other deferred revenue 626 424 565 401
Liabilities from severance payments 140 139 96 96
Miscellaneous other liabilities 670 538 679 537
  8,271 4,440 9,287 4,779

Liabilities from early retirement arrangements for civil servants exist ­vis-à-vis the Civil Service Pension Fund and arise from payment obligations under agreements that had already been concluded in prior years. The ­obligations are payable in up to seven annual installments following retirement. EUR 0.3 billion of the decline in liabilities from straight-line leases was attributable to exchange rate effects from the translation of U.S. dollars into euros.