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Note 33 - Employee Benefits - Reconciliation in Movement of Liabilities and Assets - Impact on Balance Sheet (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Reconciliation in Movement of Liabilities and Assets, Impact on Balance Sheet, Grouping [Domain Member]    
thereof, Reconciliation    
Net asset (liability) recognized € 735 [1] € 971 [2]
Change in the present value of the defined benefit obligation [Member]    
Reconciliation in Movement of Liabilities and Assets, Impact on Balance Sheet [line items]    
Change in the present value of the defined benefit obligation: Balance, beginning of year 14,999 20,404
Defined benefit cost recognized in Profit & Loss [Abstract]    
Current service cost 164 230
Interest cost 606 289
Past service cost and gain or loss arising from settlements 9 19
Defined benefit cost recognized in Other Comprehensive Income [Abstract]    
Actuarial gain or loss arising from changes in financial assumptions 517 (5,400)
Actuarial gain or loss arising from changes in demographic assumptions (24) 104
Actuarial gain or loss arising from experience 102 204
Cash flow and other changes [Abstract]    
Contributions by plan participants 17 17
Benefits paid (746) (775)
Payments in respect to settlements 0 0
Acquisitions/Divestitures, Cashflows and other changes 0 (4)
Exchange rate changes 37 (89)
Other, Cash Flow and Other Changes 0 0
Change in the present value of the defined benefit obligation: Balance, end of year 15,681 14,999
thereof, Reconciliation    
Unfunded 219 228
Funded 15,462 14,771
Change in fair value of plan assets [Member]    
Reconciliation in Movement of Liabilities and Assets, Impact on Balance Sheet [line items]    
Change in fair value of plan assets: Balance, beginning of year 16,077 20,888
Defined benefit cost recognized in Profit & Loss [Abstract]    
Interest income 654 299
Defined benefit cost recognized in Other Comprehensive Income [Abstract]    
Return from plan assets less interest income 298 (3,890)
Cash flow and other changes [Abstract]    
Contributions by plan participants 17 17
Contributions by the employer 125 [3] (325) [4]
Benefits paid (721) [5] (752) [6]
Payments in respect to settlements 0 0
Acquisitions/Divestitures, Cashflows and other changes 0 0
Exchange rate changes 77 (153)
Other, Cash Flow and Other Changes 0 0
thereof, Reconciliation    
Plan administration costs (9) (7)
Change in fair value of plan assets: Balance, end of year 16,518 16,077
Funded status, end of year 837 1,078
Change in irrecoverable surplus (asset ceiling) [Member]    
Reconciliation in Movement of Liabilities and Assets, Impact on Balance Sheet [line items]    
Change in irrecoverable surplus (asset ceiling): Balance, beginning of year (107) (90)
Defined benefit cost recognized in Profit & Loss [Abstract]    
Interest cost (2) 0
Defined benefit cost recognized in Other Comprehensive Income [Abstract]    
Changes in irrecoverable surplus 13 (12)
Cash flow and other changes [Abstract]    
Exchange rate changes (6) (5)
thereof, Reconciliation    
Change in irrecoverable surplus (asset ceiling): Balance, end of year (102) (107)
Germany [Member] | Reconciliation in Movement of Liabilities and Assets, Impact on Balance Sheet, Grouping [Domain Member]    
thereof, Reconciliation    
Net asset (liability) recognized 28 314
Germany [Member] | Change in the present value of the defined benefit obligation [Member]    
Reconciliation in Movement of Liabilities and Assets, Impact on Balance Sheet [line items]    
Change in the present value of the defined benefit obligation: Balance, beginning of year 10,037 13,097
Defined benefit cost recognized in Profit & Loss [Abstract]    
Current service cost 115 164
Interest cost 373 142
Past service cost and gain or loss arising from settlements 8 17
Defined benefit cost recognized in Other Comprehensive Income [Abstract]    
Actuarial gain or loss arising from changes in financial assumptions 387 (3,055)
Actuarial gain or loss arising from changes in demographic assumptions 36 80
Actuarial gain or loss arising from experience 45 79
Cash flow and other changes [Abstract]    
Contributions by plan participants 1 1
Benefits paid (498) (485)
Payments in respect to settlements 0 0
Acquisitions/Divestitures, Cashflows and other changes 0 (2)
Exchange rate changes 0 0
Other, Cash Flow and Other Changes 0 0
Change in the present value of the defined benefit obligation: Balance, end of year 10,504 10,037
thereof, Reconciliation    
Unfunded 0 0
Funded 10,504 10,037
Germany [Member] | Change in fair value of plan assets [Member]    
Reconciliation in Movement of Liabilities and Assets, Impact on Balance Sheet [line items]    
Change in fair value of plan assets: Balance, beginning of year 10,351 12,642
Defined benefit cost recognized in Profit & Loss [Abstract]    
Interest income 387 139
Defined benefit cost recognized in Other Comprehensive Income [Abstract]    
Return from plan assets less interest income 247 (1,594)
Cash flow and other changes [Abstract]    
Contributions by plan participants 1 1
Contributions by the employer 44 [3] (353) [4]
Benefits paid (498) [5] (485) [6]
Payments in respect to settlements 0 0
Acquisitions/Divestitures, Cashflows and other changes 0 1
Exchange rate changes 0 0
Other, Cash Flow and Other Changes 0 0
thereof, Reconciliation    
Plan administration costs 0 0
Change in fair value of plan assets: Balance, end of year 10,532 10,351
Funded status, end of year 28 314
Germany [Member] | Change in irrecoverable surplus (asset ceiling) [Member]    
Reconciliation in Movement of Liabilities and Assets, Impact on Balance Sheet [line items]    
Change in irrecoverable surplus (asset ceiling): Balance, beginning of year 0 0
Defined benefit cost recognized in Profit & Loss [Abstract]    
Interest cost 0 0
Defined benefit cost recognized in Other Comprehensive Income [Abstract]    
Changes in irrecoverable surplus 0 0
Cash flow and other changes [Abstract]    
Exchange rate changes 0 0
thereof, Reconciliation    
Change in irrecoverable surplus (asset ceiling): Balance, end of year 0 0
UK [Member] | Reconciliation in Movement of Liabilities and Assets, Impact on Balance Sheet, Grouping [Domain Member]    
thereof, Reconciliation    
Net asset (liability) recognized 886 892
UK [Member] | Change in the present value of the defined benefit obligation [Member]    
Reconciliation in Movement of Liabilities and Assets, Impact on Balance Sheet [line items]    
Change in the present value of the defined benefit obligation: Balance, beginning of year 2,876 4,929
Defined benefit cost recognized in Profit & Loss [Abstract]    
Current service cost 9 18
Interest cost 137 88
Past service cost and gain or loss arising from settlements 2 2
Defined benefit cost recognized in Other Comprehensive Income [Abstract]    
Actuarial gain or loss arising from changes in financial assumptions 55 (1,966)
Actuarial gain or loss arising from changes in demographic assumptions (59) 29
Actuarial gain or loss arising from experience 55 97
Cash flow and other changes [Abstract]    
Contributions by plan participants 0 0
Benefits paid (109) (131)
Payments in respect to settlements 0 0
Acquisitions/Divestitures, Cashflows and other changes 0 0
Exchange rate changes 60 (190)
Other, Cash Flow and Other Changes 0 0
Change in the present value of the defined benefit obligation: Balance, end of year 3,026 2,876
thereof, Reconciliation    
Unfunded 9 10
Funded 3,017 2,866
UK [Member] | Change in fair value of plan assets [Member]    
Reconciliation in Movement of Liabilities and Assets, Impact on Balance Sheet [line items]    
Change in fair value of plan assets: Balance, beginning of year 3,768 6,019
Defined benefit cost recognized in Profit & Loss [Abstract]    
Interest income 180 108
Defined benefit cost recognized in Other Comprehensive Income [Abstract]    
Return from plan assets less interest income (5) (1,982)
Cash flow and other changes [Abstract]    
Contributions by plan participants 0 0
Contributions by the employer 0 [3] 0 [4]
Benefits paid (108) [5] (130) [6]
Payments in respect to settlements 0 0
Acquisitions/Divestitures, Cashflows and other changes 0 0
Exchange rate changes 83 (243)
Other, Cash Flow and Other Changes 0 0
thereof, Reconciliation    
Plan administration costs (6) (4)
Change in fair value of plan assets: Balance, end of year 3,912 3,768
Funded status, end of year 886 892
UK [Member] | Change in irrecoverable surplus (asset ceiling) [Member]    
Reconciliation in Movement of Liabilities and Assets, Impact on Balance Sheet [line items]    
Change in irrecoverable surplus (asset ceiling): Balance, beginning of year 0 0
Defined benefit cost recognized in Profit & Loss [Abstract]    
Interest cost 0 0
Defined benefit cost recognized in Other Comprehensive Income [Abstract]    
Changes in irrecoverable surplus 0 0
Cash flow and other changes [Abstract]    
Exchange rate changes 0 0
thereof, Reconciliation    
Change in irrecoverable surplus (asset ceiling): Balance, end of year 0 0
US [Member] | Reconciliation in Movement of Liabilities and Assets, Impact on Balance Sheet, Grouping [Domain Member]    
thereof, Reconciliation    
Net asset (liability) recognized (169) (206)
US [Member] | Change in the present value of the defined benefit obligation [Member]    
Reconciliation in Movement of Liabilities and Assets, Impact on Balance Sheet [line items]    
Change in the present value of the defined benefit obligation: Balance, beginning of year 1,202 1,351
Defined benefit cost recognized in Profit & Loss [Abstract]    
Current service cost 7 10
Interest cost 61 39
Past service cost and gain or loss arising from settlements 0 0
Defined benefit cost recognized in Other Comprehensive Income [Abstract]    
Actuarial gain or loss arising from changes in financial assumptions 39 (196)
Actuarial gain or loss arising from changes in demographic assumptions 0 (5)
Actuarial gain or loss arising from experience (7) 3
Cash flow and other changes [Abstract]    
Contributions by plan participants 0 0
Benefits paid (89) (92)
Payments in respect to settlements 0 0
Acquisitions/Divestitures, Cashflows and other changes 0 0
Exchange rate changes (41) 92
Other, Cash Flow and Other Changes 0 0
Change in the present value of the defined benefit obligation: Balance, end of year 1,172 1,202
thereof, Reconciliation    
Unfunded 138 143
Funded 1,034 1,059
US [Member] | Change in fair value of plan assets [Member]    
Reconciliation in Movement of Liabilities and Assets, Impact on Balance Sheet [line items]    
Change in fair value of plan assets: Balance, beginning of year 996 1,148
Defined benefit cost recognized in Profit & Loss [Abstract]    
Interest income 50 33
Defined benefit cost recognized in Other Comprehensive Income [Abstract]    
Return from plan assets less interest income 28 (184)
Cash flow and other changes [Abstract]    
Contributions by plan participants 0 0
Contributions by the employer 40 [3] 0 [4]
Benefits paid (74) [5] (77) [6]
Payments in respect to settlements 0 0
Acquisitions/Divestitures, Cashflows and other changes 0 0
Exchange rate changes (35) 79
Other, Cash Flow and Other Changes 0 0
thereof, Reconciliation    
Plan administration costs (2) (3)
Change in fair value of plan assets: Balance, end of year 1,003 996
Funded status, end of year (169) (206)
US [Member] | Change in irrecoverable surplus (asset ceiling) [Member]    
Reconciliation in Movement of Liabilities and Assets, Impact on Balance Sheet [line items]    
Change in irrecoverable surplus (asset ceiling): Balance, beginning of year 0 0
Defined benefit cost recognized in Profit & Loss [Abstract]    
Interest cost 0 0
Defined benefit cost recognized in Other Comprehensive Income [Abstract]    
Changes in irrecoverable surplus 0 0
Cash flow and other changes [Abstract]    
Exchange rate changes 0 0
thereof, Reconciliation    
Change in irrecoverable surplus (asset ceiling): Balance, end of year 0 0
Other [Member] | Reconciliation in Movement of Liabilities and Assets, Impact on Balance Sheet, Grouping [Domain Member]    
thereof, Reconciliation    
Net asset (liability) recognized (10) (29)
Other [Member] | Change in the present value of the defined benefit obligation [Member]    
Reconciliation in Movement of Liabilities and Assets, Impact on Balance Sheet [line items]    
Change in the present value of the defined benefit obligation: Balance, beginning of year 884 1,027
Defined benefit cost recognized in Profit & Loss [Abstract]    
Current service cost 33 38
Interest cost 35 20
Past service cost and gain or loss arising from settlements (1) 0
Defined benefit cost recognized in Other Comprehensive Income [Abstract]    
Actuarial gain or loss arising from changes in financial assumptions 36 (183)
Actuarial gain or loss arising from changes in demographic assumptions (1) 0
Actuarial gain or loss arising from experience 9 25
Cash flow and other changes [Abstract]    
Contributions by plan participants 16 16
Benefits paid (50) (67)
Payments in respect to settlements 0 0
Acquisitions/Divestitures, Cashflows and other changes 0 (2)
Exchange rate changes 18 9
Other, Cash Flow and Other Changes 0 0
Change in the present value of the defined benefit obligation: Balance, end of year 979 884
thereof, Reconciliation    
Unfunded 72 75
Funded 907 809
Other [Member] | Change in fair value of plan assets [Member]    
Reconciliation in Movement of Liabilities and Assets, Impact on Balance Sheet [line items]    
Change in fair value of plan assets: Balance, beginning of year 962 1,079
Defined benefit cost recognized in Profit & Loss [Abstract]    
Interest income 37 19
Defined benefit cost recognized in Other Comprehensive Income [Abstract]    
Return from plan assets less interest income 28 (130)
Cash flow and other changes [Abstract]    
Contributions by plan participants 16 16
Contributions by the employer 41 [3] 28 [4]
Benefits paid (41) [5] (60) [6]
Payments in respect to settlements 0 0
Acquisitions/Divestitures, Cashflows and other changes 0 (1)
Exchange rate changes 29 11
Other, Cash Flow and Other Changes 0 0
thereof, Reconciliation    
Plan administration costs (1) 0
Change in fair value of plan assets: Balance, end of year 1,071 962
Funded status, end of year 92 78
Other [Member] | Change in irrecoverable surplus (asset ceiling) [Member]    
Reconciliation in Movement of Liabilities and Assets, Impact on Balance Sheet [line items]    
Change in irrecoverable surplus (asset ceiling): Balance, beginning of year (107) (90)
Defined benefit cost recognized in Profit & Loss [Abstract]    
Interest cost (2) 0
Defined benefit cost recognized in Other Comprehensive Income [Abstract]    
Changes in irrecoverable surplus 13 (12)
Cash flow and other changes [Abstract]    
Exchange rate changes (6) (5)
thereof, Reconciliation    
Change in irrecoverable surplus (asset ceiling): Balance, end of year € (102) € (107)
[1] Thereof € 1,087 million recognized in Other assets and € 353 million in Other liabilities
[2] Thereof € 1,326 million recognized in Other assets and € 355 million in Other liabilities
[3] Net Amount includes re-imbursement of 2023 benefit payments
[4] Net Amount includes re-imbursement of 2022 benefit payments and a forgiven benefit payment from 2021
[5] For funded plans only
[6] For funded plans only