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Post-Employment Benefits (Tables)
 9 Months Ended
Sep. 30, 2023
Postemployment Benefits [Abstract]  
Summary of net periodic benefit costs relating to the company's defined benefit and other post-employment plans The following table summarizes net periodic benefit cost relating to the company’s defined benefit and other post-employment plans:
Defined
benefit plans		Other post-
employment plans
Three months ended
September 30,		Nine months ended
September 30,		Three months ended
September 30,		Nine months ended
September 30,
(in millions)20232022202320222023202220232022
Service cost$68 $113 $203 $342 $9 $13 $27 $38 
Interest cost108 74 324 223 9 6 28 18 
Expected return on plan assets(181)(177)(543)(536)— — — — 
Amortization of prior service cost (credit)— 1 1 2 (9)(10)(27)(29)
Amortization of actuarial loss4 57 12 173 3 7 9 20 
Net periodic benefit cost (credit)$(1)$68 $(3)$204 $12 $16 $37 $47