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Pension Plans and Other Post Employment Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
Three Months Ended
June 30,
Six Months Ended
June 30,
(In millions)2021202020212020
Defined Benefit Pension Plans:
Service cost$$$12 $13 
Interest cost91 140 182 281 
Expected return on plan assets(228)(249)(458)(500)
Amortization of unrecognized loss13 27 
Amortization of prior service benefit(1)(1)(1)(1)
Settlement loss— 
Net periodic (credit) benefit cost$(120)$(100)$(237)$(202)
Other Post Employment Benefits:
Service cost$— $— $— $
Interest cost17 11 33 
Amortization of unrecognized loss24 — 47 — 
Amortization of prior service benefit(231)— (461)— 
Curtailment gain(1)— (1)— 
Net periodic (credit) benefit cost$(203)$17 $(404)$34