v3.8.0.1
Taxes - Reconciliation of Swedish Income Tax Rate with Effective Tax Rate (Detail) - SEK (kr)
kr in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]      
Expected tax expense at Swedish tax rate 22.0% kr 8,652 kr (886) kr (4,372)
Effect of foreign tax rates 205 (536) (1,101)
Current income taxes related to prior years 83 (489) (104)
Remeasurement of tax loss carry-forwards (150) 143 (250)
Remeasurement of deductible temporary differences 127 119 185
Tax effect of non-deductible expenses (4,144) (1,357) (1,559)
Tax effect of non-taxableincome 480 935 981
Tax effect of changes in tax rates (986) (60) 21
Tax expense/benefit kr 4,267 kr (2,131) kr (6,199)
Effective tax rate 10.80% 52.90% 31.20%