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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2020
Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
Components of net periodic benefit cost (income) of the pension plans for the three months ended June 30 were as follows:
In millionsU.S. Pension BenefitsInternational Pension BenefitsTotal Pension Benefits
202020192020201920202019
Net service cost$—  $—  $2  $1  $2  $1  
Interest cost13  17  2  515  22  
Expected return on plan assets(9) (12) (6) (7) (15) (19) 
Net periodic benefit cost (income)$4  $5  $(2) $(1) $2  $4  

Components of net periodic benefit cost (income) of the pension plans for the six months ended June 30 were as follows:
In millionsU.S. Pension BenefitsInternational Pension BenefitsTotal Pension Benefits
202020192020201920202019
Net service cost$—  $—  $3  $3  $3  $3  
Interest cost26  $33  6  $10  32  $43  
Expected return on plan assets(18) $(22) (13) $(15) (31) $(37) 
Net periodic benefit cost (income)$8  $11  $(4) $(2) $4  $9  
Postretirement Plan  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block] The benefit from the postretirement plan for the following periods were:
In millionsThree months ended June 30Six months ended June 30
2020201920202019
Interest cost$—  $—  $—  $—  
Amortization of:
   Prior service benefit—  (1) (1) $(2) 
Net postretirement benefit$—  $(1) $(1) $(2) 
Postemployment Retirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The net cost of the postemployment plan for the following periods were:
Three months ended June 30Six months ended June 30
In millions2020201920202019
Net service cost$7  $5  $13  $19  
Interest cost1  1  1  2  
Amortization of:
   Prior service benefit(1) (1) (1) (2) 
   Actuarial gain(1) —  (2) (1) 
Net benefit cost$6  $5  $11  $18