v3.26.1
Financial structure and financial costs - Maturity of derivative instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Financial structure, financial costs and financial instruments      
Fair value, financial assets $ 77,261 $ 83,240 $ 84,725
Fair value, financial liabilities (121,706) (114,755) (112,648)
Swaps hedging bonds | Not later than one year | Fair value hedge      
Financial structure, financial costs and financial instruments      
Fair value, financial assets 49    
Fair value, financial liabilities   (45) (75)
Total fair value 49 (45) (75)
Notional value, Assets 202   250
Notional value, Liabilities   1,630 1,837
Total notional value 202 1,630 2,087
Swaps hedging bonds | Not later than one year | Cash flow hedge      
Financial structure, financial costs and financial instruments      
Fair value, financial assets 32 29 91
Fair value, financial liabilities (218) (380) (193)
Total fair value (186) (351) (102)
Notional value, Assets 823 2,428 2,114
Notional value, Liabilities 3,245 2,059 1,574
Total notional value 4,068 4,487 3,688
Swaps hedging bonds | Due after 12 months | Fair value hedge      
Financial structure, financial costs and financial instruments      
Fair value, financial assets 68 27 45
Fair value, financial liabilities (511) (803) (570)
Total fair value (443) (776) (525)
Notional value, Assets 1,451 403 403
Notional value, Liabilities 7,051 8,301 5,681
Total notional value 8,502 8,704 6,084
Swaps hedging bonds | Due after 12 months | Cash flow hedge      
Financial structure, financial costs and financial instruments      
Fair value, financial assets 744 519 628
Fair value, financial liabilities (451) (1,510) (1,628)
Total fair value 293 (991) (1,000)
Notional value, Assets 14,879 11,317 14,830
Notional value, Liabilities 6,177 11,828 11,016
Total notional value 21,056 23,145 25,846
Swaps hedging bonds | Year 2 | Fair value hedge      
Financial structure, financial costs and financial instruments      
Total notional value 820 202 1,630
Swaps hedging bonds | Year 2 | Cash flow hedge      
Financial structure, financial costs and financial instruments      
Total notional value 2,070 4,116 4,509
Swaps hedging bonds | Year 3 | Fair value hedge      
Financial structure, financial costs and financial instruments      
Total notional value 1,000 820 202
Swaps hedging bonds | Year 3 | Cash flow hedge      
Financial structure, financial costs and financial instruments      
Total notional value 4,672 2,143 4,153
Swaps hedging bonds | Year 4 | Fair value hedge      
Financial structure, financial costs and financial instruments      
Total notional value 789 1,000 820
Swaps hedging bonds | Year 4 | Cash flow hedge      
Financial structure, financial costs and financial instruments      
Total notional value 5,643 4,740 2,135
Swaps hedging bonds | Year 5 | Fair value hedge      
Financial structure, financial costs and financial instruments      
Total notional value 875 789 1,000
Swaps hedging bonds | Year 5 | Cash flow hedge      
Financial structure, financial costs and financial instruments      
Total notional value 450 5,667 4,686
Swaps hedging bonds | More than 5 years | Fair value hedge      
Financial structure, financial costs and financial instruments      
Total notional value 5,018 5,893 2,432
Swaps hedging bonds | More than 5 years | Cash flow hedge      
Financial structure, financial costs and financial instruments      
Total notional value 8,221 6,479 10,363
Forward exchange contracts related to operating activities | Not later than one year      
Financial structure, financial costs and financial instruments      
Fair value, financial assets 12   2
Fair value, financial liabilities (1) (13) (14)
Total fair value 11 (13) (12)
Notional value, Assets 358 94 83
Notional value, Liabilities 99 271 234
Total notional value 457 365 317
Forward exchange contracts related to operating activities | Due after 12 months      
Financial structure, financial costs and financial instruments      
Fair value, financial assets 25   8
Fair value, financial liabilities (3) (23) (2)
Total fair value 22 (23) 6
Notional value, Assets 328   311
Notional value, Liabilities 325 634 240
Total notional value 653 634 551
Forward exchange contracts related to operating activities | Year 2      
Financial structure, financial costs and financial instruments      
Total notional value 328 307 285
Forward exchange contracts related to operating activities | Year 3      
Financial structure, financial costs and financial instruments      
Total notional value 325 327 266
Held for trading - Other interest rate swaps | Not later than one year      
Financial structure, financial costs and financial instruments      
Fair value, financial assets 137 154 149
Fair value, financial liabilities (124) (124) (94)
Total fair value 13 30 55
Notional value, Assets 50,776 50,861 38,415
Notional value, Liabilities 41,730 59,075 37,170
Total notional value 92,506 109,936 75,585
Held for trading - Other interest rate swaps | Due after 12 months      
Financial structure, financial costs and financial instruments      
Fair value, financial assets 250 342 393
Fair value, financial liabilities (252) (281) (208)
Total fair value (2) 61 185
Notional value, Assets 30,186 36,851 7,690
Notional value, Liabilities 31,207 36,220 7,407
Total notional value 61,393 73,071 15,097
Held for trading - Other interest rate swaps | Year 2      
Financial structure, financial costs and financial instruments      
Total notional value 31,266 52,496 8,692
Held for trading - Other interest rate swaps | Year 3      
Financial structure, financial costs and financial instruments      
Total notional value 7,141 8,714 1,580
Held for trading - Other interest rate swaps | Year 4      
Financial structure, financial costs and financial instruments      
Total notional value 3,878 2,739 1,500
Held for trading - Other interest rate swaps | Year 5      
Financial structure, financial costs and financial instruments      
Total notional value 2,983 2,821 1,908
Held for trading - Other interest rate swaps | More than 5 years      
Financial structure, financial costs and financial instruments      
Total notional value 16,124 6,300 1,417
Held for trading - Currency swaps and forward exchange contracts | Not later than one year      
Financial structure, financial costs and financial instruments      
Fair value, financial assets 32 196 66
Fair value, financial liabilities (46) (115) (84)
Total fair value (14) 81 (18)
Notional value, Assets 7,052 17,698 10,325
Notional value, Liabilities 9,860 5,212 8,513
Total notional value 16,912 22,910 18,838
Held for trading - Currency swaps and forward exchange contracts | Due after 12 months      
Financial structure, financial costs and financial instruments      
Fair value, financial assets 5 5 21
Fair value, financial liabilities (6)   (32)
Total fair value (1) 5 (11)
Notional value, Assets 360 322 1,071
Notional value, Liabilities 515 (45) 773
Total notional value 875 277 1,844
Held for trading - Currency swaps and forward exchange contracts | Year 2      
Financial structure, financial costs and financial instruments      
Total notional value 735 116 1,840
Held for trading - Currency swaps and forward exchange contracts | Year 3      
Financial structure, financial costs and financial instruments      
Total notional value $ 140 $ 161 (2)
Held for trading - Currency swaps and forward exchange contracts | Year 4      
Financial structure, financial costs and financial instruments      
Total notional value     $ 6