v3.24.3
Retirement Benefits - Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)        
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Immediate Recognition of Actuarial Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]     Other income/(loss), net  
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]     Other income/(loss), net  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]     Other income/(loss), net  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Other Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration]     Other income/(loss), net  
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement and Curtailment Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]     Other income/(loss), net  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration]     Other income/(loss), net  
Worldwide OPEB        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)        
Service cost $ 6 $ 5 $ 18 $ 16
Interest cost 57 58 170 173
Expected return on assets 0 0 0 0
Amortization of prior service costs/(credits) 2 1 7 3
Net remeasurement (gain)/loss 0 0 0 0
Defined Benefit Plan, Other Cost (Credit) 0 0 0 0
Settlements and curtailments 0 0 0 0
Net periodic benefit cost/(income) 65 64 195 192
Pension Plan        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)        
Net remeasurement (gain)/loss 168   (15)  
Settlements and curtailments 128   125  
UNITED STATES | Pension Plan        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)        
Service cost 73 74 219 221
Interest cost 400 413 1,201 1,226
Expected return on assets (455) (474) (1,365) (1,440)
Amortization of prior service costs/(credits) 23 0 70 0
Net remeasurement (gain)/loss 112 176 112 370
Defined Benefit Plan, Other Cost (Credit) 7 3 16 15
Settlements and curtailments 128 20 128 65
Net periodic benefit cost/(income) 288 212 381 457
Foreign Plan | Pension Plan        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)        
Service cost 62 62 186 184
Interest cost 237 245 705 724
Expected return on assets (256) (227) (763) (669)
Amortization of prior service costs/(credits) 6 7 18 17
Net remeasurement (gain)/loss 56 (7) (127) 1
Defined Benefit Plan, Other Cost (Credit) 30 57 97 118
Settlements and curtailments 0 1 (3) 2
Net periodic benefit cost/(income) $ 135 $ 138 $ 113 $ 377