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Statement of Cash Flows - Summary of Adjustments to Reconcile Net Income to Cash (Detail) - SEK (kr) kr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Adjustments To Reconcile Net Income To Cash [Line Items] |  |  |
Depreciations | kr 3,602 | kr 3,587 | kr 3,275
Impairment losses/reversals of impairments | 512 | 360 | 568
Adjustments to reconcile net income to cash | 14,915 | 12,226 | 7,830
Depreciations | 2,387 | 2,474 |
Impairment losses/reversals of impairments | 47 | 75 |
Amortizations | 1,989 | 2,538 | 3,946
Write down of goodwill |  |  | 275
Total impairments | 137 | 55 | 529
Total depreciation, amortization and impairment losses on property, plant and equipment and intangible assets | 8,674 | 9,089 | 8,318
Taxes | 6,123 | 1,652 | (1,897)
Dividends from joint ventures/associated companies | 43 | 66 | 30
Undistributed earnings in joint ventures/ associated companies | 331 | 340 | (53)
Gains/losses on sales of investments and operations, intangible assets and PP&E, net | 77 | (812) | 212
Other non-cash items | (333) | 1,891 | 1,220
Right-of-use assets [member] |  |  |
Disclosure Of Adjustments To Reconcile Net Income To Cash [Line Items] |  |  |
Adjustments to reconcile net income to cash | 2,434 | 2,549 |
Intangible asset and goodwill [member] |  |  |
Disclosure Of Adjustments To Reconcile Net Income To Cash [Line Items] |  |  |
Adjustments to reconcile net income to cash | 2,126 | 2,593 | 4,475
Property, plant and equipments [member] |  |  |
Disclosure Of Adjustments To Reconcile Net Income To Cash [Line Items] |  |  |
Adjustments to reconcile net income to cash | 4,114 | 3,947 | 3,843
Capitalized development expenditure [member] |  |  |
Disclosure Of Adjustments To Reconcile Net Income To Cash [Line Items] |  |  |
Amortizations | 906 | 1,519 | 2,559
Impairments |  | 36 | 254
Intellectual property rights brands and other intangible assets [member] |  |  |
Disclosure Of Adjustments To Reconcile Net Income To Cash [Line Items] |  |  |
Amortizations | 1,083 | 1,019 | kr 1,387
Impairments | kr 137 | kr 19 |

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