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Pension Plans and Other Post Employment Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2021
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
Three Months Ended
March 31,
(In millions)20212020
Defined Benefit Pension Plans:
Service cost$$
Interest cost91 141 
Expected return on plan assets(230)(251)
Amortization of unrecognized loss14 
Settlement loss
Net periodic benefit credit$(117)$(102)
Other Post Employment Benefits:
Service cost$— $
Interest cost16 
Amortization of unrecognized loss23 — 
Amortization of prior service benefit(230)— 
Net periodic benefit (credit) cost$(201)$17