v3.25.4
Retirement Benefits - Schedule of Benefit Obligations and Plan Assets and Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Pension Plans      
Change in benefit obligation:      
Benefit obligation at beginning of year $ 13,415 $ 14,258  
Service cost 324 339 $ 290
Interest cost 697 662 648
Actuarial (gain) loss 232 (1,084)  
Benefits paid (661) (634)  
Foreign currency exchange rate changes and other adjustments 255 (125)  
Benefit obligation at end of year 14,262 13,415 14,258
Change in plan assets:      
Fair value of plan assets at beginning of year 14,820 13,658 13,709
Actual return on plan assets 1,456 583  
Employer contribution 119 115  
Benefits paid (661) (634)  
Foreign currency exchange rate changes and other adjustments 248 (115)  
Fair value of plan assets at end of year 14,820 13,658 13,709
Funded status 558 243  
Unrecognized net actuarial loss 2,499 2,663  
Unrecognized prior service (benefit) cost 2 4  
Net amount recognized 3,059 2,910  
Amounts recognized in the consolidated balance sheets consisted of:      
Other noncurrent assets 1,857 1,482  
Other current liabilities (73) (71)  
Other noncurrent liabilities (1,226) (1,167)  
Accumulated other comprehensive loss 2,501 2,667  
Net amount recognized 3,059 2,910  
Retiree Health Benefit Plans      
Change in benefit obligation:      
Benefit obligation at beginning of year 1,223 1,310  
Service cost 33 35 32
Interest cost 64 62 61
Actuarial (gain) loss 33 (97)  
Benefits paid (88) (82)  
Foreign currency exchange rate changes and other adjustments 9 (6)  
Benefit obligation at end of year 1,274 1,223 1,310
Change in plan assets:      
Fair value of plan assets at beginning of year 2,775 2,566 2,580
Actual return on plan assets 283 59  
Employer contribution 14 9  
Benefits paid (88) (82)  
Foreign currency exchange rate changes and other adjustments 0 0  
Fair value of plan assets at end of year 2,775 2,566 $ 2,580
Funded status 1,501 1,343  
Unrecognized net actuarial loss 87 149  
Unrecognized prior service (benefit) cost (4) (4)  
Net amount recognized 1,584 1,489  
Amounts recognized in the consolidated balance sheets consisted of:      
Other noncurrent assets 1,656 1,485  
Other current liabilities (9) (8)  
Other noncurrent liabilities (146) (133)  
Accumulated other comprehensive loss 83 146  
Net amount recognized $ 1,584 $ 1,489