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Pension Plans, Postretirement and Other Employee Benefits (Tables)
 12 Months Ended
Dec. 31, 2020
Retirement Benefits [Abstract]  
Amounts Recognized in Balance Sheets for Pension Plans and Postretirement Benefit Plan
The measurement date for all defined benefit plans is December 31. The following provides a reconciliation of the plans’ benefit obligations, plan assets, and funded status as of December 31, 2020 and 2019:
 Pension PlansOther Postretirement Benefits Plans
U.S.Non-U.S.
 202020192020201920202019
Change in benefit obligation:
Benefit obligation, beginning of year$1,320 $1,302 $1,048 $946 $300 $322 
Service cost1 2 25 24 — 1 
Interest cost41 53 18 24 9 13 
Settlement— (67)(17)(5)— — 
Administrative expenses/taxes paid— — (5)(4)— — 
Plan amendments1 — — — (59)(17)
Actuarial (gain)/loss114 105 28 105 5 6 
Other— — 2 — — — 
Benefits paid(94)(75)(44)(44)(18)(26)
Participants’ contributions— — 1 1 — 1 
Currency rate conversion and other— — 66 1 — — 
Benefit obligation, end of year1,383 1,320 1,122 1,048 237 300 
Change in plan assets:
Fair value of plan assets, beginning of year1,062 995 523 466 — — 
Settlement— (67)(17)(5)— — 
Actual return on plan assets126 183 47 55 — — 
Administrative expenses/taxes paid— — (5)(4)— — 
Employer contributions51 26 42 42 18 25 
Participants’ contributions— — 1 1 — 1 
Benefits paid(94)(75)(44)(44)(18)(26)
Other— — 2 — — — 
Currency rate conversion and other— — 22 12 — — 
Fair value of plan assets, end of year1,145 1,062 571 523 — — 
Funded status of the plans$(238)$(258)$(551)$(525)$(237)$(300)
Schedule of Amounts Recognized in Balance Sheet
Amounts recognized on the consolidated balance sheets consist of the following at December 31, 2020 and 2019:
 Pension PlansOther Postretirement Benefits Plans
U.S.Non-U.S.
 202020192020201920202019
Noncurrent assets$— $— $37 $35 $— $— 
Current liabilities(2)(4)(18)(17)(23)(25)
Noncurrent liabilities (a)
(236)(254)(570)(543)(214)(275)
$(238)$(258)$(551)$(525)$(237)$(300)
(a) Included in “Pension and postretirement benefits” within in the consolidated balance sheets is postemployment benefits of $81 million and $73 million at December 31, 2020 and 2019 which are not included in the tables above.
Amounts Recognized in Accumulated Other Comprehensive Loss for Pension Benefits
Amounts recognized in accumulated other comprehensive loss for pension and postretirement benefits, inclusive of tax effects, consist of the following components at December 31, 2020 and 2019:
 Pension PlansOther Postretirement Benefits Plans
U.S.Non-U.S.
 202020192020201920202019
Actuarial loss$275 $230 $136 $145 $29 $34 
Prior service cost/(credit)1 — 3 3 (91)(70)
Total$276 $230 $139 $148 $(62)$(36)
Projected Benefit Obligation Accumulated Benefit Obligation and Fair Value of Plan Assets for all Pension Plans
Information for defined benefit plans with projected benefit obligations in excess of plan assets:
 Pension PlansOther Postretirement Benefits Plans
 20202019
 U.S.Non-U.S.U.S.Non-U.S.20202019
Projected benefit obligation$1,383 $743 $1,320 $712 $237 $300 
Fair value of plan assets$1,145 $155 $1,062 $151 $— $— 

Information for pension plans with accumulated benefit obligations in excess of plan assets:
 December 31, 2020December 31, 2019
 U.S.Non-U.S.U.S.Non-U.S.
Projected benefit obligation$1,383 $696 $1,320 $682 
Accumulated benefit obligation$1,383 $654 $1,320 $637 
Fair value of plan assets$1,145 $118 $1,062 $126 
Components of Net Periodic Benefit Cost
Net periodic pension and postretirement benefits costs for the years ended December 31, 2020, 2019 and 2018, consist of the following components:
Pension PlansOther Postretirement
Benefits Plans
U.S.Non-U.S.
 202020192018202020192018202020192018
Service cost $1 $2 $1 $25 $24 $14 $— $1 $— 
Interest cost41 53 21 18 24 15 9 13 8 
Expected return on plan assets(64)(67)(28)(17)(19)(18)— — — 
Curtailment loss (gain)— — — — — — (21)(7)1 
Settlement loss1 6 1 6 1 3 — — — 
Net amortization:
Actuarial loss6 5 5 8 5 6 2 4 5 
Prior service cost (credit)— — — — 1 1 (7)(8)— 
Net periodic costs$(15)$(1)$— $40 $36 $21 $(17)$3 $14 
Assumptions Used in Accounting for Pension Plans
The following assumptions were used in the accounting for the pension and other postretirement benefits plans for the years ended December 31, 2020, 2019, and 2018:
Pension PlansOther Postretirement
Benefits Plans
U.S.Non-U.S.
 202020192018202020192018202020192018
Weighted-average assumptions used to determine benefit obligations:
Discount rate2.3 %3.2 %4.2 %1.5 %1.7 %2.6 %2.5 %3.2 %4.3 %
Rate of compensation increasen/an/an/a1.8 %2.0 %3.0 %n/an/an/a
Interest crediting rate4.2 %4.2 %4.2 %1.8 %1.8 %1.8 %n/an/an/a
Weighted-average assumptions used to determine net periodic benefit cost:
Discount rate3.2 %4.2 %4.1 %1.7 %2.6 %2.4 %3.2 %4.3 %4.2 %
Expected long-term return on plan assets6.3 %6.3 %6.0 %3.5 %4.0 %4.2 %n/an/an/a
Rate of compensation increasen/an/an/a2.0 %2.0 %2.9 %n/an/an/a
Interest crediting rate4.2 %4.2 %4.2 %1.8 %1.8 %1.8 %n/an/an/a
Estimated Pension Plan Benefit Payments
Estimated future benefit payments are as follows:
Pension PlansOther Postretirement Benefits Plans
YearU.S.Non-U.S.
2021$96 $48 $23 
2022$97 $49 $19 
2023$99 $51 $18 
2024$95 $50 $18 
2025$93 $49 $17 
2026-2030$398 $268 $72 
Schedule of Health Care Cost Trend Rate
The weighted-average assumed health care cost trend rate used in determining next year's postretirement health care benefits are as follows:
 Other Postretirement Benefits Plans
 202020192018
Initial health care cost trend rate6.3 %6.6 %6.9 %
Ultimate health care cost trend rate4.9 %4.9 %4.9 %
Year ultimate health care cost trend rate reached202720272027
Pension Plan Assets Invested
Pension plan assets were invested in the following classes of securities:
 Percentage of Fair Market Value
 December 31, 2020
 U.S.Non-U.S.
Equity securities66 %26 %
Fixed income securities12 %2 %
Debt securities12 %46 %
Insurance contracts— %20 %
Other10 %6 %
Plan Assets using Fair Value Hierarchy
The following table presents the Company’s defined benefit plan assets measured at fair value by asset class: 
 Fair Value Level as of December 31, 2020
 U.S.Non-U.S.
Asset CategoryLevel 1Level 2Level 3TotalLevel 1Level 2Level 3Total
Investments with registered investment companies:
Equity securities$374 $— $— $374 $1 $— $— $1 
Fixed income securities140 — — 140 12 — — 12 
Real estate and other21 — — 21 — — — — 
Equity securities242 — — 242 21 42 — 63 
Debt securities:
Corporate and other— 13 — 13 10 — — 10 
Government25 39 — 64 14 189 — 203 
Real Estate and other— — — — 1 30 — 31 
Insurance contracts— — — — — — 113 113 
Hedge funds— — 17 17 — — — — 
Cash and equivalents80 — — 80 5 — — 5 
Total$882 $52 $17 $951 $64 $261 $113 $438 
Plan assets measured at net asset value
Equity securities$137 $84 
Government debt securities— 36 
Corporate and other debt securities57 13 
Total plan assets measured at net asset value194 133 
Net plan assets$1,145 $571 
 Fair Value Level as of December 31, 2019
 U.S.Non-U.S.
Asset CategoryLevel 1Level 2Level 3TotalLevel 1Level 2Level 3Total
Investments with registered investment companies:
Equity securities$337 $— $— $337 $1 $— $— $1 
Fixed income securities158 — — 158 23 — — 23 
Real estate and other38 — — 38 — — — — 
Equity securities238 — — 238 18 58 — 76 
Debt securities:
Corporate and other— 21 — 21 6 — — 6 
Government12 21 — 33 5 166 — 171 
Real Estate and other— — — — 3 10 — 13 
Insurance contracts— — — — — — 80 80 
Hedge funds— — 21 21 — — — — 
Cash and equivalents34 — — 34 14 — — 14 
Total$817 $42 $21 $880 $70 $234 $80 $384 
Plan assets measured at net asset value
Equity securities$128 $92 
Government debt securities— 33 
Corporate and other debt securities54 14 
Total plan assets measured at net asset value182 139 
Net plan assets$1,062 $523 
Significant Concentrations of Risk
The following table contains information about significant concentrations of risk, including all individual assets that make up more than 5% of the total assets and any direct investments in Tenneco stock:
Asset CategoryFair Value 
Level		Fair ValuePercentage of
Total Assets
2020:
Tenneco stock1 $4 0.2 %
2019:
Tenneco stock1 $5 0.3 %