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Retirement Plans (Tables)
 12 Months Ended
Dec. 31, 2020
Retirement Benefits [Abstract]  
Schedule of Benefits To Be Paid From Retirement Plans Over The Next 10 Years We expect the following benefits to be paid from our defined benefit plans over the next 10 years:
Pension
Benefits		Other  Post-retirement
Benefits
2021$887 $64 
2022912 63 
2023935 62 
2024961 60 
2025981 59 
2026-20305,094 273 
Schedule of Annual Pension and Other Post-retirement Benefit Costs
Net annual benefit cost (credit) consisted of the following:
Pension Benefits
Year Ended December 31202020192018
Service cost$115 $111 $180 
Interest cost491 600 532 
Expected return on plan assets(926)(911)(856)
Net actuarial loss387 355 375 
Prior service credit(18)(19)(46)
Net annual benefit cost$49 $136 $185 
Other Post-retirement Benefits
Year Ended December 31202020192018
Service cost$10 $8 $10 
Interest cost27 35 33 
Expected return on plan assets(36)(36)(40)
Net actuarial gain(3)(8)(4)
Prior service credit(1)(3)(4)
Net annual benefit credit$(3)$(4)$(5)
Schedule of Reconciliation of Benefit Obligations And Plan or Trust Assets And Resulting Funded Status Of Defined Benefit Retirement Plans The following is a reconciliation of the benefit obligations and plan/trust assets, and the resulting funded status, of our defined benefit plans:
 Pension BenefitsOther Post-retirement Benefits
Year Ended December 312020201920202019
Change in Benefit Obligation
Benefit obligation at beginning of year$(18,107)$(15,720)$(1,027)$(935)
Service cost(115)(111)(10)(8)
Interest cost(491)(600)(27)(35)
Amendments37 (3)2 (8)
Actuarial loss(1,780)(2,446)(60)(101)
Settlement/curtailment/other(65)(33)(4)(4)
Benefits paid829 806 64 64 
Benefit obligation at end of year$(19,692)$(18,107)$(1,062)$(1,027)
Change in Plan/Trust Assets
Fair value of assets at beginning of year$13,177 $11,532 $644 $570 
Actual return on plan assets1,843 2,206 102 117 
Employer contributions480 185 — 2 
Settlement/curtailment/other58 39 — — 
Benefits paid(807)(785)(41)(45)
Fair value of assets at end of year$14,751 $13,177 $705 $644 
Funded status at end of year$(4,941)$(4,930)$(357)$(383)
Schedule of Amounts Recognized On Consolidated Balance Sheet
Amounts recognized on the Consolidated Balance Sheet consisted of the following:
 Pension BenefitsOther Post-retirement Benefits
December 312020201920202019
Noncurrent assets$69 $61 $121 $94 
Current liabilities(181)(166)(125)(130)
Noncurrent liabilities(4,829)(4,825)(353)(347)
Net liability recognized$(4,941)$(4,930)$(357)$(383)
Schedule of Amounts Deferred In AOCI
Amounts deferred in AOCL for our defined benefit plans consisted of the following:
 Pension BenefitsOther Post-retirement Benefits
December 312020201920202019
Net actuarial loss (gain)$5,752 $5,276 $(12)$(9)
Prior service (credit) cost(93)(73)12 12 
Total amount recognized in AOCL, pretax$5,659 $5,203 $— $3 
The following is a reconciliation of the change in AOCL for our defined benefit plans:
 Pension BenefitsOther Post-retirement Benefits
Year Ended December 312020201920202019
Net actuarial loss (gain)$863 $1,151 $(6)$20 
Prior service credit (cost)(38)3 (1)8 
Amortization of:
Net actuarial (loss) gain from prior
years		(387)(355)3 8 
Prior service credit18 19 1 3 
Change in AOCL, pretax$456 $818 $(3)$39 
Schedule of PBO That Exceeded The Plans' Assets On December 31, 2020 and 2019, most of our pension plans had a PBO that exceeded the plans’ assets. Summary information for those plans follows:
December 3120202019
PBO$(19,189)$(17,651)
Fair value of plan assets14,191 12,673 
Schedule of ABO That Exceeded The Plans' Assets On December 31, 2020 and 2019, most of our defined benefit plans had an ABO that exceeded the plans’ assets. Summary information for those plans follows:
Pension BenefitsOther Post-retirement Benefits
December 312020201920202019
ABO$(18,596)$(17,080)$(784)$(783)
Fair value of plan assets13,829 12,354 300 301 
Schedule of Assumptions Used To Determine Benefit Obligations And Benefit Costs
The following table summarizes the weighted average assumptions used to determine our benefit obligations:
Assumptions on December 3120202019
Pension Benefits
Benefit obligation discount rate2.54 %3.19 %
Rate of increase in compensation levels2.66 %2.68 %
Other Post-retirement Benefits
Benefit obligation discount rate2.52 %3.18 %
Healthcare cost trend rate:
Trend rate for next year6.00 %6.00 %
Ultimate trend rate5.00 %5.00 %
Year rate reaches ultimate trend rate20242024
The following table summarizes the weighted average assumptions used to determine our net annual benefit cost:
Assumptions for Year Ended December 31202020192018
Pension Benefits
Discount rates:
Benefit obligation3.19 %4.28 %3.69 %
Service cost2.74 %3.81 %3.51 %
Interest cost2.78 %3.92 %3.34 %
Expected long-term rate of return on assets7.41 %7.46 %7.45 %
Rate of increase in compensation levels2.73 %2.77 %2.79 %
Other Post-retirement Benefits
Discount rates:
Benefit obligation3.18 %4.24 %3.64 %
Service cost3.35 %4.23 %3.79 %
Interest cost2.78 %3.88 %3.27 %
Expected long-term rate of return on assets6.86 %6.84 %7.75 %
Schedule of Asset Allocation Policy Ranges At the end of 2020, our asset allocation policy ranges were:
Equities
48-68%
Fixed income
20-48%
Cash
0-5%
Other asset classes
0-16%
Schedule of Fair Value of Plan Assets By Investment Category And The Corresponding Level Within The Fair Value Hierarchy
The fair value of our pension plan assets by investment category and the corresponding level within the fair value hierarchy were as follows:



Fair
Value		Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Asset CategoryDecember 31, 2020
Cash and equivalents$112 $— $112 $— 
Equity securities (a):
U.S. companies
1,137 1,137 — — 
Non-U.S. companies
90 90 — — 
Private equity investments
33 — — 33 
Fixed-income securities:
Corporate bonds (b)
3,532 — 3,532 — 
Treasury securities
1,129 — 1,129 — 
Commingled funds:
Equity funds
7,306 — 7,306 — 
Fixed-income funds
416 — 416 — 
Real estate funds
90 — — 90 
Other investments:
Insurance deposit contracts
157 — — 157 
Retirement annuity contracts
38 — — 38 
Total plan assets in fair value hierarchy$14,040 $1,227 $12,495 $318 
Plan assets measured using NAV as a practical expedient (c):
Real estate funds
446 
Hedge funds
254 
Equity funds
11 
Total pension plan assets$14,751 
(a)No single equity holding amounted to more than 1% of the total fair value.
(b)Our corporate bond investments had an average rating of A-.
(c)Investments measured at fair value using NAV as a practical expedient are not classified in the fair value hierarchy. The fair value amounts presented in this table for these investments are included to permit reconciliation of the fair value hierarchy to the total plan assets.



Fair
Value		Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Asset CategoryDecember 31, 2019
Cash and equivalents$56 $— $56 $— 
Equity securities (a):
U.S. companies
958 958 — — 
Non-U.S. companies
128 128 — — 
Private equity investments
26 — — 26 
Fixed-income securities:
Corporate bonds (b)
2,163 — 2,163 — 
Treasury securities
1,855 — 1,855 — 
Commingled funds:
Equity funds
6,494 — 6,494 — 
Fixed-income funds
365 — 365 — 
Real estate funds
84 — — 84 
Other investments:
Insurance deposit contracts
137 — — 137 
Retirement annuity contracts35 — — 35 
Total plan assets in fair value hierarchy$12,301 $1,086 $10,933 $282 
Plan assets measured using NAV as a practical expedient (c):
Real estate funds443 
Hedge funds419 
Equity funds
14 
Total pension plan assets$13,177 
(a)No single equity holding amounted to more than 1% of the total fair value.
(b)Our corporate bond investments had an average rating of A.
(c)Investments measured at fair value using NAV as a practical expedient are not classified in the fair value hierarchy. The fair value amounts presented in this table for these investments are included to permit reconciliation of the fair value hierarchy to the total plan assets.
The fair value of our other post-retirement benefit plan assets by category and the corresponding level within the fair value hierarchy were as follows:



Fair
Value		Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)
Asset Category (a)December 31, 2020
Cash and equivalents$16 $— $16 
Equity securities97 97 — 
Fixed-income securities134 — 134 
Commingled funds:
Equity funds
320 — 320 
Fixed-income funds
128 — 128 
Real estate funds
2 2 — 
Total plan assets in fair value hierarchy$697 $99 $598 
Plan assets measured using NAV as a practical expedient (b):
Real estate funds
5 
Hedge funds3 
Total other post-retirement benefit plan assets$705 
(a)We had no Level 3 investments on December 31, 2020.
(b)Investments measured at fair value using NAV as a practical expedient are not classified in the fair value hierarchy. The fair value amounts presented in this table for these investments are included to permit reconciliation of the fair value hierarchy to the total plan assets.




Fair
Value		Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)
Asset Category (a)December 31, 2019
Cash and equivalents$18 $— $18 
Equity securities92 92 — 
Fixed-income securities122 — 122 
Commingled funds:
Equity funds
288 — 288 
Fixed-income funds
113 — 113 
Real estate funds
2 2 — 
Total plan assets in fair value hierarchy$635 $94 $541 
Plan assets measured using NAV as a practical expedient (b):
Real estate funds5 
Hedge funds4 
Total other post-retirement benefit plan assets$644 
(a)We had no Level 3 investments on December 31, 2019.
(b)Investments measured at fair value using NAV as a practical expedient are not classified in the fair value hierarchy. The fair value amounts presented in this table for these investments are included to permit reconciliation of the fair value hierarchy to the total plan assets.
Schedule of Changes In Level 3 Retirement Plan Assets
Changes in our Level 3 defined benefit plan assets during 2020 and 2019 were as follows:
Private Equity InvestmentsReal Estate FundsInsurance Deposits ContractsRetirement Annuity ContractsTotal
Level 3 Assets
December 31, 2018$20 $68 $128 $— $216 
Actual return on plan assets:
Unrealized gains, net5 6 6 — 17 
Purchases, sales and settlements, net1 10 3 35 49 
December 31, 201926 84 137 35 282 
Actual return on plan assets:
Unrealized gains, net
5 7 18 3 33 
Realized losses, net— (1)— — (1)
Purchases, sales and settlements, net2 — 2 — 4 
December 31, 2020$33 $90 $157 $38 $318