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Post-Employment Benefits (Tables)
 6 Months Ended
Jun. 30, 2022
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
June 30,		Six months ended
June 30,		Three months ended
June 30,		Six months ended
June 30,
(in millions)20222021202220212022202120222021
Service cost$113 $109 $229 $221 $13 $12 $25 $24 
Interest cost75 60 149 118 6 4 12 9 
Expected return on plan assets(179)(166)(359)(332)— — — — 
Amortization of prior service cost (credit)— — 1 1 (9)(9)(19)(19)
Amortization of actuarial loss59 75 116 145 6 8 13 16 
Net periodic benefit cost$68 $78 $136 $153 $16 $15 $31 $30