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Employee Postretirement Benefits (Tables)
 12 Months Ended
Dec. 31, 2020
Benefit Cost Information or Defined Benefit Plan and Other Postretirement Benefit Plan
Summarized financial information about postretirement plans, excluding defined contribution retirement plans, is presented below:
Pension BenefitsOther Benefits
Year Ended December 31
2020201920202019
Change in Benefit Obligation
Benefit obligation at beginning of year$4,047 $3,687 $693 $673 
Service cost22 21 8 8 
Interest cost95 121 23 28 
Actuarial (gain) loss(a)
333 446 42 36 
Currency and other134 51 (10)— 
Benefit payments from plans(169)(142)— — 
Direct benefit payments(8)(10)(47)(52)
Settlements and curtailments(113)(127)— — 
Benefit obligation at end of year4,341 4,047 709 693 
Change in Plan Assets
Fair value of plan assets at beginning of year3,803 3,398 — — 
Actual return on plan assets489 572 — — 
Employer contributions40 50 — — 
Currency and other120 51 — — 
Benefit payments(169)(142)— — 
Settlements(90)(126)— — 
Fair value of plan assets at end of year4,193 3,803 — — 
Funded Status$(148)$(244)$(709)$(693)
(a) The actuarial net losses in 2020 and 2019 were primarily due to discount rate decreases in 2020 and 2019.
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan
Information for the Principal Plans and All Other Pension Plans
Principal PlansAll Other
Pension Plans		Total
Year Ended December 31
202020192020201920202019
Projected benefit obligation (“PBO”)$3,629 $3,406 $712 $641 $4,341 $4,047 
Accumulated benefit obligation (“ABO”)3,629 3,406 619 561 4,248 3,967 
Fair value of plan assets3,627 3,303 566 500 4,193 3,803 
Pension Plans with an ABO in Excess of Plan Assets
Information for Pension Plans with an ABO in Excess of Plan Assets
December 31
20202019
ABO$311 $1,956 
Fair value of plan assets119 1,714 
Pension Plans with a PBO in Excess of Plan Assets
Information for Pension Plans with a PBO in Excess of Plan Assets
December 31
20202019
PBO$744 $2,303 
Fair value of plan assets529 2,039 
Components of Net Periodic Benefit Cost
Components of Net Periodic Benefit Cost
Pension BenefitsOther Benefits
Year Ended December 31
202020192018202020192018
Service cost$22 $21 $36 $8 $8 $11 
Interest cost95 121 128 23 28 28 
Expected return on plan assets(a)
(134)(144)(166)— — — 
Recognized net actuarial loss42 44 47 1 — 1 
Settlements and curtailments
49 45 136 — — — 
Other
(4)(4)(7)(2)(1)(3)
Net periodic benefit cost$70 $83 $174 $30 $35 $37 
(a)The expected return on plan assets is determined by multiplying the fair value of plan assets at the remeasurement date, typically the prior year-end adjusted for estimated current year cash benefit payments and contributions, by the expected long-term rate of return.
Weighted-Average Assumptions Used to Determine Net Cost
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost for Years Ended December 31
Pension BenefitsOther Benefits
Projected 2021202020192018202020192018
Discount rate1.93 %2.44 %3.40 %3.23 %3.51 %4.50 %3.91 %
Expected long-term return on plan assets3.41 %3.66 %4.39 %4.50 %— — — 
Rate of compensation increase3.07 %3.08 %3.08 %2.27 %— — — 

Weighted-Average Assumptions Used to Determine Benefit Obligations at December 31
Pension BenefitsOther Benefits
2020201920202019
Discount rate1.93 %2.51 %2.69 %3.51 %
Rate of compensation increase3.07 %3.08 %— — 
Estimated Future Benefit Payments Over the next ten years, we expect that the following gross benefit payments will occur:
Pension BenefitsOther Benefits
2021$207 $56 
2022227 58 
2023220 58 
2024224 58 
2025220 55 
2026-20301,085 247 
Principal plan assets as of 2019  
Pension Plan Assets of the Principal Plans Measured at Fair Value
Fair Value Measurements at December 31, 2020
Total
Plan Assets		Assets at Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)		Assets at Significant
Observable
Inputs
(Level 2)		Assets at Significant
Unobservable
Inputs
(Level 3)
Cash and Cash Equivalents
Held directly$56 $56 $— $— 
Held through mutual and pooled funds measured at net asset value15 — — — 
Fixed Income
Held directly
U.S. government and municipals191 171 20 — 
U.S. corporate debt310 — 310 — 
International bonds42 — 42 — 
Held through mutual and pooled funds measured at net asset value
U.S. government and municipals167 — — — 
U.S. corporate debt730 — — — 
International bonds1,062 — — — 
Equity
Held directly
U.S. equity18 18 — — 
International equity31 31 — — 
Held through mutual and pooled funds measured at net asset value
Non-U.S. equity107 — — — 
Global equity517 — — — 
Insurance Contracts380 — — 380 
Other1 1 — — 
Total Plan Assets$3,627 $277 $372 $380 
Principal plan assets as of 2018  
Pension Plan Assets of the Principal Plans Measured at Fair Value
Fair Value Measurements at December 31, 2019
Total
Plan Assets		Assets at Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)
Assets at Significant
Observable
Inputs
(Level 2)
Assets at Significant
Unobservable
Inputs
(Level 3)
Cash and Cash Equivalents
Held directly$44 $44 $— $— 
Held through mutual and pooled funds measured at net asset value31 — — — 
Fixed Income
Held directly
U.S. government and municipals161 147 14 — 
U.S. corporate debt221 — 221 — 
International bonds9 — 9 — 
Held through mutual and pooled funds measured at net asset value
U.S. government and municipals153 — — — 
U.S. corporate debt662 — — — 
International bonds937 — — — 
Equity
Held directly
U.S. equity
39 39 — — 
International equity32 32 — — 
Held through mutual and pooled funds measured at net asset value
Non-U.S. equity86 — — — 
Global equity572 — — — 
Insurance Contracts372 — — 372 
Other(16)(4)— — 
Total Plan Assets$3,303 $258 $244 $372