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Pension and Other Postretirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2020
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
The net periodic benefit cost (credit) for pension and other postretirement benefit plans consisted of the following components:
Pension Benefits
U.S.InternationalOther Postretirement Benefits
Years Ended December 31202020192018202020192018202020192018
Service cost$360 $293 $326 $301 $238 $238 $52 $48 $57 
Interest cost431 458 432 137 177 178 57 69 69 
Expected return on plan assets
(774)(817)(851)(415)(426)(431)(75)(72)(83)
Amortization of unrecognized prior service cost
(49)(49)(50)(18)(12)(13)(73)(78)(84)
Net loss (gain) amortization303 151 232 127 64 84 (18)(10)1 
Termination benefits10 31 19 3 8 2 2 5 3 
Curtailments10 14 10 — 6 1 (4)(11)(8)
Settlements13 — 5 15 1 13 — — — 
Net periodic benefit cost (credit)$304 $81 $123 $150 $56 $72 $(59)$(49)$(45)
Obligation and Funded Status
Summarized information about the changes in plan assets and benefit obligations, the funded status and the amounts recorded at December 31 is as follows:
 Pension BenefitsOther
Postretirement
Benefits
U.S.International
  202020192020201920202019
Fair value of plan assets January 1$11,361 $9,648 $10,163 $8,580 $1,102 $968 
Actual return on plan assets1,908 2,165 1,026 1,505 175 203 
Company contributions199 130 387 262 19 14 
Effects of exchange rate changes— — 746 31 — — 
Benefits paid(751)(582)(215)(230)(93)(104)
Settlements(45)— (117)(12)— — 
Other— — 59 27 18 21 
Fair value of plan assets December 31$12,672 $11,361 $12,049 $10,163 $1,221 $1,102 
Benefit obligation January 1$13,003 $10,620 $10,612 $9,083 $1,673 $1,615 
Service cost360 293 301 238 52 48 
Interest cost431 458 137 177 57 69 
Actuarial losses (gains) (1)
1,594 2,165 1,036 1,313 (98)21 
Benefits paid(751)(582)(215)(230)(93)(104)
Effects of exchange rate changes— — 794 4 (3)1 
Plan amendments— — (64)1 — — 
Curtailments11 18 (8)3 (1)— 
Termination benefits10 31 3 8 2 5 
Settlements(45)— (117)(12)— — 
Other— — 55 27 18 18 
Benefit obligation December 31$14,613 $13,003 $12,534 $10,612 $1,607 $1,673 
Funded status December 31$(1,941)$(1,642)$(485)$(449)$(386)$(571)
Recognized as:
Other Assets$— $— $941 $837 $— $— 
Accrued and other current liabilities(82)(92)(13)(18)(9)(10)
Other Noncurrent Liabilities(1,859)(1,550)(1,413)(1,268)(377)(561)
(1) Actuarial losses (gains) primarily reflect changes in discount rates.
Schedule of Accumulated and Projected Benefit Obligations in Excess of Fair Value of Plan Assets
Information related to the funded status of selected pension plans at December 31 is as follows:
U.S.International
2020201920202019
Pension plans with a projected benefit obligation in excess of plan assets
Projected benefit obligation$14,613 $13,003 $8,951 $7,421 
Fair value of plan assets12,672 11,361 7,526 6,135 
Pension plans with an accumulated benefit obligation in excess of plan assets
Accumulated benefit obligation$13,489 $12,009 $4,288 $2,476 
Fair value of plan assets11,685 10,484 3,033 1,501 
Schedule of Allocation of Plan Assets
The fair values of the Company’s pension plan assets at December 31 by asset category are as follows:
 Fair Value Measurements UsingFair Value Measurements Using
  Level 1Level 2Level 3
NAV (1)
TotalLevel 1Level 2Level 3
NAV (1)
Total
20202019
U.S. Pension Plans
Cash and cash equivalents$5 $— $— $303 $308 $3 $— $— $236 $239 
Investment funds
Developed markets equities
206 — — 3,884 4,090 205 — — 3,542 3,747 
Emerging markets equities
169 — — 927 1,096 165 — — 723 888 
Mortgage and asset-backed securities— 89 — — 89 — — — — — 
Government and agency obligations
— — — — — — — — 173 173 
Equity securities
Developed markets
2,819 — — — 2,819 2,451 — — — 2,451 
Fixed income securities— 
Government and agency obligations
— 2,236 — — 2,236 — 2,094 — — 2,094 
Corporate obligations
— 1,994 — — 1,994 — 1,582 — — 1,582 
Mortgage and asset-backed securities
— 33 — — 33 — 178 — — 178 
Other investments— — 7 — 7 — — 9 — 9 
Plan assets at fair value$3,199 $4,352 $7 $5,114 $12,672 $2,824 $3,854 $9 $4,674 $11,361 
International Pension Plans
Cash and cash equivalents$110 $1 $— $20 $131 $70 $1 $— $15 $86 
Investment funds
Developed markets equities
475 4,286 — 118 4,879 546 3,761 — 96 4,403 
Government and agency obligations
1,516 2,614 — 172 4,302 462 2,534 — 207 3,203 
Emerging markets equities
154 — — 92 246 66 96 — 90 252 
Corporate obligations
5 12 — 172 189 5 11 — 109 125 
Other fixed income obligations9 11 — 4 24 9 6 — — 15 
Real estate
— 1 — 15 16 — 1 — — 1 
Equity securities
Developed markets
505 — — — 505 565 — — — 565 
Fixed income securities
Government and agency obligations
3 486 — 3 492 3 376 — — 379 
Corporate obligations
1 174 — 2 177 1 135 — — 136 
Mortgage and asset-backed securities
— 70 — — 70 — 61 — — 61 
Other investments
Insurance contracts (2)
— 76 935 1 1,012 — 65 851 — 916 
Other
1 5 — — 6 — 5 — 16 21 
Plan assets at fair value
$2,779 $7,736 $935 $599 $12,049 $1,727 $7,052 $851 $533 $10,163 
(1)    Certain investments that were measured at net asset value (NAV) per share or its equivalent have not been classified in the fair value hierarchy. The NAV amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the fair value of plan assets at December 31, 2020 and 2019.
(2)    The plans’ Level 3 investments in insurance contracts are generally valued using a crediting rate that approximates market returns and invest in underlying securities whose market values are unobservable and determined using pricing models, discounted cash flow methodologies, or similar techniques.
The fair values of the Company’s other postretirement benefit plan assets at December 31 by asset category are as follows:
 Fair Value Measurements UsingFair Value Measurements Using
  Level 1Level 2Level 3
NAV (1)
TotalLevel 1Level 2Level 3
NAV (1)
Total
  2020  2019  
Cash and cash equivalents$31 $— $— $28 $59 $52 $— $— $22 $74 
Investment funds
Developed markets equities
19 — — 355 374 19 — — 324 343 
Emerging markets equities
16 — — 85 101 15 — — 66 81 
Government and agency obligations
1 — — — 1 1 — — 16 17 
Mortgage and asset-backed securities— 8 — — 8 — — — — — 
Equity securities— 
Developed markets
258 — — — 258 225 — — — 225 
Fixed income securities
Government and agency obligations
— 221 — — 221 — 196 — — 196 
Corporate obligations
— 196 — — 196 — 149 — — 149 
Mortgage and asset-backed securities
— 3 — — 3 — 17 — — 17 
Plan assets at fair value$325 $428 $— $468 $1,221 $312 $362 $— $428 $1,102 
(1)    Certain investments that were measured at net asset value (NAV) per share or its equivalent have not been classified in the fair value hierarchy. The NAV amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the fair value of plan assets at December 31, 2020 and 2019.
Summary of Changes in Fair Value of Company's Level 3 Pension Plan Assets
The table below provides a summary of the changes in fair value, including transfers in and/or out, of all financial assets measured at fair value using significant unobservable inputs (Level 3) for the Company’s pension plan assets:
 20202019
  Insurance
Contracts		Real
Estate		OtherTotalInsurance
Contracts		Real
Estate		OtherTotal
U.S. Pension Plans
Balance January 1$— $— $9 $9 $— $— $13 $13 
Actual return on plan assets:
Relating to assets still held at December 31
— — (5)(5)— — (8)(8)
Relating to assets sold during the year
— — 5 5 — — 8 8 
Purchases and sales, net— — (2)(2)— — (4)(4)
Balance December 31$— $— $7 $7 $— $— $9 $9 
International Pension Plans
Balance January 1$851 $— $— $851 $811 $1 $1 $813 
Actual return on plan assets:
Relating to assets still held at December 31
103 — — 103 54 — — 54 
Purchases and sales, net(17)— — (17)(14)(1)(1)(16)
Transfers out of Level 3(2)— — (2)— — — — 
Balance December 31$935 $— $— $935 $851 $— $— $851 
Summary of Expected Benefit Payments
Expected benefit payments are as follows:
U.S. Pension BenefitsInternational Pension
Benefits		Other
Postretirement
Benefits
2021$816 $274 $85 
2022786 277 86 
2023781 284 87 
2024772 285 89 
2025782 287 91 
2026 — 20304,271 1,688 474 
Components of Other Comprehensive Income The following amounts were reflected as components of OCI:
 Pension PlansOther Postretirement
Benefit Plans
U.S.International
Years Ended December 31202020192018202020192018202020192018
Net (loss) gain arising during the period$(448)$(816)$(397)$(407)$(227)$(505)$198 $112 $186 
Prior service (cost) credit arising during the period
(1)(4)(4)62 (1)(10)(3)(11)2 
 $(449)$(820)$(401)$(345)$(228)$(515)$195 $101 $188 
Net loss (gain) amortization included in benefit cost$303 $151 $232 $127 $64 $84 $(18)$(10)$1 
Prior service credit amortization included in benefit cost
(49)(49)(50)(18)(12)(13)(73)(78)(84)
 $254 $102 $182 $109 $52 $71 $(91)$(88)$(83)
Summary of Weighted Average Assumptions Used in Determining Pension Plan and U.S. Pension and Other Postretirement Benefit Plan Information
The Company reassesses its benefit plan assumptions on a regular basis. The weighted average assumptions used in determining U.S. pension and other postretirement benefit plan and international pension plan information are as follows:
 U.S. Pension and Other
Postretirement Benefit Plans		International Pension Plans
December 31202020192018202020192018
Net periodic benefit cost      
Discount rate3.40 %4.40 %3.70 %1.50 %2.20 %2.10 %
Expected rate of return on plan assets7.30 %8.10 %8.20 %4.40 %4.90 %5.10 %
Salary growth rate4.20 %4.30 %4.30 %2.80 %2.80 %2.90 %
Interest crediting rate4.90 %3.40 %3.30 %2.80 %2.90 %2.80 %
Benefit obligation      
Discount rate2.70 %3.40 %4.40 %1.10 %1.50 %2.20 %
Salary growth rate4.60 %4.20 %4.30 %2.80 %2.80 %2.80 %
Interest crediting rate4.70 %4.90 %3.40 %3.00 %2.80 %2.90 %
Summary of Health Care Cost Trend Rate Assumptions for Other Postretirement Benefit Plans
The health care cost trend rate assumptions for other postretirement benefit plans are as follows:
December 3120202019
Health care cost trend rate assumed for next year6.6 %6.8 %
Rate to which the cost trend rate is assumed to decline4.5 %4.5 %
Year that the trend rate reaches the ultimate trend rate20322032