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Employee Benefits (Tables)
 12 Months Ended
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Significant Unobservable Inputs
Presented in the tables below are a reconciliation of the beginning and ending balances of the fair value measurements using significant unobservable inputs (Level 3) for 2020 and 2019, respectively:
 Level 3
Balance as of January 1, 2020$349 
Actual return on assets3 
Purchases, issuances and settlements, net4 
Balance as of December 31, 2020$356 
 Level 3
Balance as of January 1, 2019$230 
Actual return on assets25 
Purchases, issuances and settlements, net94 
Balance as of December 31, 2019$349 
Schedule of Rollforward Changes in Benefit Obligation and Plan Assets
Presented in the table below is a rollforward of the changes in the benefit obligation and plan assets for the two most recent years, for all plans combined:
 Pension BenefitsOther Benefits
 2020201920202019
Change in benefit obligation:    
Benefit obligation as of January 1,$2,161 $1,892 $374 $353 
Service cost31 28 4 4 
Interest cost73 82 12 15 
Plan participants' contributions— — 2 2 
Plan amendments— — 5 (1)
Actuarial loss (gain)233 264 13 25 
Settlements (a)
(3)— — — 
Gross benefits paid(109)(105)(29)(25)
Federal subsidy— — 1 1 
Benefit obligation as of December 31,$2,386 $2,161 $382 $374 
Change in plan assets:    
Fair value of plan assets as of January 1,$1,747 $1,499 $532 $507 
Actual return on plan assets314 319 53 51 
Employer contributions41 33 (2)(2)
Plan participants' contributions— — 2 2 
Settlements (a)
(3)— — — 
Benefits paid(109)(104)(29)(26)
Fair value of plan assets as of December 31,$1,990 $1,747 $556 $532 
Funded value as of December 31,$(396)$(414)$174 $158 
Amounts recognized on the balance sheet:    
Noncurrent asset$— $— $173 $159 
Current liability(2)(3)— — 
Noncurrent liability(388)(411)(1)(1)
(Liabilities) assets related to assets held for sale (b)
(6)— 2 — 
Net amount recognized$(396)$(414)$174 $158 
(a)The Company paid $3 million of lump sum payment distributions from the Company’s New York Water Service Corporation Pension Plan for the year ended December 31, 2020. There were no lump sum payments made for the year ended December 31, 2019.
(b)These balances are related to the pending transactions contemplated by the Stock Purchase Agreement and are included in assets held for sale and liabilities related to assets held for sale on the Consolidated Balance Sheets as of December 31, 2020. See Note 6—Acquisitions and Divestitures for additional information.
Summary of Accumulated Other Comprehensive Income and Regulatory Assets
Presented in the table below are the components of accumulated other comprehensive income and regulatory assets that have not been recognized as components of periodic benefit costs as of December 31:
 Pension BenefitsOther Benefits
 2020201920202019
Net actuarial loss$436 $435 $49 $72 
Prior service credit(16)(19)(217)(257)
Net amount recognized$420 $416 $(168)$(185)
Regulatory assets (liabilities)$366 $375 $(168)$(185)
Accumulated other comprehensive income54 41 — — 
Total$420 $416 $(168)$(185)
Schedule of Projected Benefit Obligation, Accumulated Benefit Obligation and Fair Value of Plan Assets
Presented in the tables below are the projected benefit obligation, accumulated benefit obligation and fair value of plan assets for pension plans with a projected obligation in excess of plan assets as of December 31, 2020 and 2019:
Projected Benefit Obligation Exceeds the Fair Value of Plans' Assets
 20202019
Projected benefit obligation$2,386 $2,161 
Fair value of plan assets1,990 1,748 
 Accumulated Benefit Obligation Exceeds the Fair Value of Plans' Assets
 20202019
Accumulated benefit obligation$2,188 $2,018 
Fair value of plan assets1,990 1,748 
Schedule of Expected Cash Flows for Pension and Postretirement Benefit Plans
Presented in the table below is information about the expected cash flows for the pension and postretirement benefit plans:
Pension BenefitsOther Benefits
2021 expected employer contributions:  
To plan trusts$37 $— 
To plan participants2 — 
Schedule of Expected Benefit Payments
Presented in the table below are the net benefits expected to be paid from the plan assets or the Company’s assets:
 Pension BenefitsOther Benefits
 Expected Benefit PaymentsExpected Benefit PaymentsExpected Federal Subsidy Payments
2021$127 $27 $1 
2022128 27 1 
2023133 27 1 
2024135 27 1 
2025137 26 1 
2026-2030692 123 4 
Schedule of Significant Assumptions of Pension and Other Postretirement Benefit Plans
Presented in the table below are the significant assumptions related to the pension and other postretirement benefit plans:
 Pension BenefitsOther Benefits
 202020192018202020192018
Weighted average assumptions used to determine December 31 benefit obligations:      
Discount rate2.74%3.44%4.38%2.56%3.36%4.32%
Rate of compensation increase3.51%2.97%3.00%N/AN/AN/A
Medical trendN/AN/AN/Agraded fromgraded fromgraded from
    
6.25% in 2021
6.50% in 2020
6.75% in 2019
    
to 5.00% in 2026+
to 5.00% in 2026+
to 5.00% in 2026+
Weighted average assumptions used to determine net periodic cost:      
Discount rate3.44%4.38%3.75%3.36%4.32%4.23%
Expected return on plan assets6.50%6.20%5.95%3.68%3.56%4.77%
Rate of compensation increase2.97%3.00%3.02%N/AN/AN/A
Medical trendN/AN/AN/Agraded fromgraded fromgraded from
    
6.50% in 2020
6.75% in 2019
7.00% in 2018
    
to 5.00% in 2026+
to 5.00% in 2026+
to 4.50% in 2026+
NOTE     “N/A” in the table above means assumption is not applicable.
Components of Net Periodic Benefit Costs
Presented in the table below are the components of net periodic benefit costs for the years ended December 31:
 202020192018
Components of net periodic pension benefit cost:   
Service cost$31 $28 $34 
Interest cost73 82 76 
Expected return on plan assets(111)(91)(97)
Amortization of prior service (credit) cost(3)(3)1 
Amortization of actuarial loss30 32 27 
Settlements (a)
1 — — 
Net periodic pension benefit cost$21 $48 $41 
Other changes in plan assets and benefit obligations recognized in other comprehensive income:   
Current year actuarial (gain) loss$12 $(8)$(60)
Amortization of actuarial loss(3)(4)(7)
Total recognized in other comprehensive income9 (12)(67)
Total recognized in net periodic benefit cost and other comprehensive income$30 $36 $(26)
Components of net periodic other postretirement benefit (credit) cost:   
Service cost$4 $4 $8 
Interest cost12 15 20 
Expected return on plan assets(19)(18)(26)
Amortization of prior service credit(34)(35)(23)
Amortization of actuarial loss2 3 3 
Net periodic other postretirement benefit (credit) cost$(35)$(31)$(18)
(a)Due to the amount of lump sum payment distributions from the Company’s New York Water Service Corporation Pension Plan, settlement charges of less than $1 million were recorded for the year ended December 31, 2020. There were no settlement charges recorded for the year ended December 31, 2019. In accordance with existing regulatory accounting treatment, the Company has maintained the settlement charges in regulatory assets on the Consolidated Balance Sheets. The amount is being amortized in accordance with existing regulatory practice.
Pension Plan Asset  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Changes in Fair Value of Plan Assets
Presented in the tables below are the fair values and asset allocations of the pension plan assets as of December 31, 2020 and 2019, respectively, by asset category:
Asset Category2021 Target AllocationTotalQuoted Prices in Active Markets for Identical Assets (Level 1)Significant Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)Percentage of Plan Assets as of December 31, 2020
Cash$78 $78 $— $— 4 %
Equity securities:50 %     
U.S. large cap420 420 — — 21 %
U.S. small cap124 124 — — 6 %
International367 8 169 190 18 %
Real estate fund120 — — 120 6 %
REITs7 — 7 — — %
Fixed income securities:50 %    
U.S. Treasury securities and government bonds171 163 8 — 9 %
Corporate bonds594 — 594 — 30 %
Mortgage-backed securities9 — 9 — — %
Municipal bonds34 — 34 — 2 %
Treasury futures10 10 — — 1 %
Long duration bond fund10 7 3 — 1 %
Guarantee annuity contracts46 — — 46 2 %
Total100 %$1,990 $810 $824 $356 100 %
Asset Category2020 Target AllocationTotalQuoted Prices in Active Markets for Identical Assets (Level 1)Significant Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)Percentage of Plan Assets as of December 31, 2019
Cash$39 $39 $— $— 2 %
Equity securities:50 %     
U.S. large cap358 358 — — 20 %
U.S. small cap84 78 6 — 5 %
International320 6 137 177 18 %
Real estate fund127 — — 127 7 %
REITs7 — 7 — — %
Fixed income securities:50 %    
U.S. Treasury securities and government bonds169 158 11 — 10 %
Corporate bonds542 — 542 — 31 %
Mortgage-backed securities14 — 14 — 1 %
Municipal bonds26 — 26 — 1 %
Treasury futures8 8 — — 1 %
Long duration bond fund8 8 — — 1 %
Guarantee annuity contracts45 — — 45 3 %
Total100 %$1,747 $655 $743 $349 100 %
Postretirement Benefit Plan Assets  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Changes in Fair Value of Plan Assets
Presented in the tables below are the fair values and asset allocations of the postretirement benefit plan assets as of December 31, 2020 and 2019, respectively, by asset category:
Asset Category2021 Target AllocationTotalQuoted Prices in Active Markets for Identical Assets (Level 1)Significant Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)Percentage of Plan Assets as of December 31, 2020
Bargain VEBA:      
Cash$12 $12 $— $— 3 %
Equity securities:4 %     
U.S. large cap14 14 — — 3 %
Fixed income securities:96 %    
U.S. Treasury securities and government bonds389 308 81 — 93 %
Long duration bond fund5 5 — — 1 %
Total bargain VEBA100 %$420 $339 $81 $— 100 %
Non-bargain VEBA:      
Cash$1 $1 $— $— — 
Equity securities:60 %     
U.S. large cap51 51 — — 38 %
International33 33 — — 24 %
Fixed income securities:40 %    
Core fixed income bond fund (a)
50 — 50 — 38 %
Total non-bargain VEBA100 %$135 $85 $50 $— 100 %
Life VEBA:      
Equity securities:70 %     
U.S. large cap$— $— $— $— — %
Fixed income securities:30 %    
Core fixed income bond fund (a)
1 1 — — 100 %
Total life VEBA100 %$1 $1 $— $— 100 %
Total100 %$556 $425 $131 $— 100 %
(a)Includes cash for margin requirements.
Asset Category2020 Target AllocationTotalQuoted Prices in Active Markets for Identical Assets (Level 1)Significant Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)Percentage of Plan Assets as of 12/31/2019
Bargain VEBA:      
Cash$6 $6 $— $— 2 %
Equity securities:4 %     
U.S. large cap13 13 — — 3 %
Fixed income securities:96 %    
U.S. Treasury securities and government bonds373 298 75 — 94 %
Long duration bond fund4 4 — — 1 %
Total bargain VEBA100 %$396 $321 $75 $— 100 %
Non-bargain VEBA:      
Cash$4 $4 $— $— — 
Equity securities:60 %     
U.S. large cap48 48 — — 36 %
International30 30 — — 23 %
Fixed income securities:40 %    
Core fixed income bond fund (a)
50 — 50 — 41 %
Total non-bargain VEBA100 %$132 $82 $50 $— 100 %
Life VEBA:      
Equity securities:70 %     
U.S. large cap$2 $2 $— $— 50 %
Fixed income securities:30 %    
Core fixed income bond fund (a)
2 2 — — 50 %
Total life VEBA100 %$4 $4 $— $— 100 %
Total100 %$532 $407 $125 $— 100 %
(a)Includes cash for margin requirements.