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Employee Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2024
Retirement Benefits [Abstract]  
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, Funded Status, and Schedule of Amounts Recognized in Balance Sheet [Table Text Block]
The following table presents the changes in benefit obligations and plan assets for pension benefits and other postretirement benefits for the years indicated:
 Pension BenefitsOther
Postretirement Benefits
 2024202320242023
 (Millions)
Change in benefit obligation:
Benefit obligation at beginning of year
$1,006 $940 $145 $152 
Service cost
25 23 
Interest cost
47 46 
Plan participants’ contributions
— — 
Benefits paid
(73)(71)(11)(13)
Net actuarial loss (gain) (1)(65)68 (12)(4)
Settlements
(3)— — — 
Net increase (decrease) in benefit obligation(69)66 (13)(7)
Benefit obligation at end of year
937 1,006 132 145 
Change in plan assets:
Fair value of plan assets at beginning of year
1,167 1,117 262 253 
Actual return on plan assets
88 120 16 17 
Employer contributions
Plan participants’ contributions
— — 
Benefits paid
(73)(71)(11)(13)
Settlements
(3)— — — 
Net increase (decrease) in fair value of plan assets16 50 10 
Fair value of plan assets at end of year
1,183 1,167 272 262 
Funded status — overfunded (underfunded)$246 $161 $140 $117 
Amounts recognized in the Consolidated Balance Sheet:
Noncurrent assets$270 $187 $143 $120 
Current liabilities(4)(4)(3)(3)
Noncurrent liabilities(20)(22)— — 
Funded status — overfunded (underfunded)$246 $161 $140 $117 
Accumulated benefit obligation$929 $998 
____________
(1)    2024 amounts are due primarily to changes in the following factors: Pension Benefits - discount rate assumptions and interest crediting rate assumption; Other Postretirement Benefits - discount rate assumption. 2023 amounts are due primarily to changes in the following factors: Pension Benefits - interest crediting rate assumption and discount rate assumptions.
Defined Benefit Plan, Plan with Projected Benefit Obligation in Excess of Plan Assets [Table Text Block]
The following table summarizes information for pension plans with obligations in excess of plan assets at December 31.
 20242023
 (Millions)
Projected benefit obligation$23 $26 
Accumulated benefit obligation22 24 
Fair value of plan assets— — 
Pre-tax amounts recognized in Accumulated other comprehensive income (loss)[Table Text Block]
Pre-tax amounts recognized in Accumulated other comprehensive income (loss) at December 31 are as follows:
 Pension BenefitsOther
Postretirement Benefits
 2024202320242023
 (Millions)
Net actuarial gain (loss)$49 $(45)$20 $19 
Schedule of Net Benefit Cost (Credit) [Table Text Block]
Net periodic benefit cost (credit) for the years ended December 31 consist of the following:
 Pension BenefitsOther
Postretirement  Benefits
 202420232022202420232022
 (Millions)
Components of net periodic benefit cost (credit):
Service cost
$25 $23 $28 $$$
Interest cost
47 46 31 
Expected return on plan assets
(60)(57)(44)(11)(10)(10)
Amortization of net actuarial loss (gain)
— 12 (5)(3)— 
Net actuarial loss from settlements
— — — — 
Reclassification to regulatory liability
— — — — — 
Net periodic benefit cost (credit) (1)$13 $17 $30 $(8)$(5)$(2)
____________
(1)    Components other than Service cost are included in Other income (expense) – net below Operating income (loss) in Williams’ Consolidated Statement of Income.
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss) [Table Text Block]
Other changes in plan assets and benefit obligations recognized in Other comprehensive income (loss) before taxes for the years ended December 31 consist of the following:
 Pension BenefitsOther
Postretirement  Benefits
 202420232022202420232022
 (Millions)
Net actuarial gain (loss) arising during the year$93 $(5)$(14)$$$14 
Amortization of net actuarial loss (gain)
— 12 (2)(2)— 
Net actuarial loss from settlements— — — — 
Total recognized in Other comprehensive income (loss)
$94 $— $$$$14 
Defined Benefit Plan, Assumptions [Table Text Block]
The weighted-average assumptions utilized to determine benefit obligations and Net periodic benefit cost (credit) as of December 31 are as follows:
 Pension BenefitsOther
Postretirement  Benefits
 202420232022202420232022
Benefit obligations:
Discount rate5.60 %4.98 %5.16 %5.67 %5.01 %5.20 %
Rate of compensation increase3.48 3.52 3.58 N/AN/AN/A
Cash balance interest crediting rate4.00 4.50 3.50 N/AN/AN/A
Net periodic benefit cost (credit):
Discount rate4.98 %5.16 %2.84 %5.01 %5.20 %2.93 %
Expected long-term rate of return on plan assets5.31 5.17 3.81 4.16 4.04 3.67 
Rate of compensation increase3.52 3.58 3.67 N/AN/AN/A
Cash balance interest crediting rate4.50 3.50 3.00 N/AN/AN/A
Fair values of plan assets [Table Text Block]
The fair values of Williams’ pension and other postretirement benefits plan assets by asset class at December 31 are as follows: 
 2024
Pension BenefitsOther Postretirement Benefits
  
Level 1 (1)Level 2 (2)TotalLevel 1 (1)Level 2 (2)Total
 (Millions)
Cash management funds$29 $— $29 $103 $— $103 
Government debt securities74 19 93 11 14 
Corporate debt securities— 295 295 — 43 43 
Other— — — 
$104 $318 422 $114 $46 160 
Commingled investment funds (3):
Equities 292 43 
Fixed income 469 69 
Total assets at fair value$1,183 $272 
 2023
Pension BenefitsOther Postretirement Benefits
 Level 1 (1)Level 2 (2)TotalLevel 1 (1)Level 2 (2)Total
 (Millions)
Cash management funds$17 $— $17 $99 $— $99 
Government debt securities61 17 78 11 
Corporate debt securities— 311 311 — 44 44 
Other— 
$80 $333 413 $109 $46 155 
Commingled investment funds (3):
Equities287 41 
Fixed income467 66 
Total assets at fair value$1,167 $262 
____________
(1)    Level 1 includes assets with fair values based on quoted prices in active markets for identical assets. Cash management funds and U.S. Treasury securities are included in this level.
(2)    Level 2 includes assets with fair values determined by using significant other observable inputs. This level includes fixed income securities, other than U.S. Treasury securities, that are valued primarily using pricing models which incorporate observable inputs such as benchmark yields, reported trades, broker/dealer quotes, and issuer spreads.
(3)    The commingled investment funds are measured at fair value using net asset value per share. Certain standard withdrawal restrictions generally apply, which may include redemption notification periods ranging from 1 day to 15 days.
Expected benefit payments [Table Text Block]
Following are the expected benefit payments, which reflect the same assumptions previously discussed and future service as appropriate.
Pension
Benefits
Other
Postretirement
Benefits
 (Millions)
2025
$101 $11 
2026
95 11 
2027
91 11 
2028
87 11 
2029
83 10 
2030-2034
389 48