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Employee Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2023
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
 2023202220232022
 (Millions)
Change in benefit obligation:
Benefit obligation at beginning of year
$940 $1,133 $152 $200 
Service cost
23 28 
Interest cost
46 31 
Plan participants’ contributions
— — 
Benefits paid
(71)(78)(13)(12)
Net actuarial loss (gain) (1)68 (162)(4)(45)
Settlements
— (12)— — 
Net increase (decrease) in benefit obligation66 (193)(7)(48)
Benefit obligation at end of year
1,006 940 145 152 
Change in plan assets:
Fair value of plan assets at beginning of year
1,117 1,336 253 287 
Actual return on plan assets
120 (132)17 (27)
Employer contributions
Plan participants’ contributions
— — 
Benefits paid
(71)(78)(13)(12)
Settlements
— (12)— — 
Net increase (decrease) in fair value of plan assets50 (219)(34)
Fair value of plan assets at end of year
1,167 1,117 262 253 
Funded status — overfunded (underfunded)$161 $177 $117 $101 
Amounts recognized in the Consolidated Balance Sheet:
Noncurrent assets$187 $201 $120 $105 
Current liabilities(4)(2)(3)(4)
Noncurrent liabilities(22)(22)— — 
Funded status — overfunded (underfunded)$161 $177 $117 $101 
Accumulated benefit obligation$998 $930 
____________
(1)    2023 amounts are due primarily to changes in the following factors: Pension Benefits - interest crediting rate assumption and discount rate assumptions. 2022 amounts are due primarily to changes in the following factors: Pension Benefits - discount rate assumptions, partially offset by interest crediting rate assumption; Other Postretirement Benefits - discount rate assumption.
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.
 20232022
 (Millions)
Projected benefit obligation$26 $24 
Accumulated benefit obligation24 22 
Fair value of plan assets— — 
Pre-tax amounts recognized in Accumulated other comprehensive income (loss)[Table Text Block]
Pre-tax amounts recognized in Accumulated other comprehensive income (loss) at December 31 are as follows:
 Pension BenefitsOther
Postretirement Benefits
 2023202220232022
 (Millions)
Net actuarial gain (loss)$(45)$(45)$19 $18 
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
 202320222021202320222021
 (Millions)
Components of net periodic benefit cost (credit):
Service cost
$23 $28 $30 $$$
Interest cost
46 31 28 
Expected return on plan assets
(57)(44)(43)(10)(10)(10)
Amortization of net actuarial loss (gain)
12 14 (3)— — 
Net actuarial loss from settlements
— — — — 
Reclassification to regulatory liability
— — — — 
Net periodic benefit cost (credit) (1)$17 $30 $30 $(5)$(2)$(2)
____________
(1)    Components other than Service cost are included in Other income (expense) – net below Operating income (loss) in our Consolidated Statement of Income.
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss) [Table Text Block]
Other changes in plan assets and benefit obligations recognized in Other comprehensive income (loss) before taxes for the years ended December 31 consist of the following:
 Pension BenefitsOther
Postretirement  Benefits
 202320222021202320222021
 (Millions)
Net actuarial gain (loss) arising during the year$(5)$(14)$40 $$14 $29 
Amortization of net actuarial loss (gain)
12 14 (2)— — 
Net actuarial loss from settlements— — — — 
Total recognized in Other comprehensive income (loss)
$— $$55 $$14 $29 
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
 202320222021202320222021
Benefit obligations:
Discount rate4.98 %5.16 %2.82 %5.01 %5.20 %2.93 %
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
Net periodic benefit cost (credit):
Discount rate5.16 %2.84 %2.45 %5.20 %2.93 %2.59 %
Expected long-term rate of return on plan assets5.17 3.81 3.69 4.04 3.67 3.61 
Rate of compensation increase3.58 3.67 3.76 N/AN/AN/A
Cash balance interest crediting rate3.50 3.00 3.00 N/AN/AN/A
Fair values of plan assets [Table Text Block]
The fair values of our pension and other postretirement benefits plan assets by asset class at December 31 are as follows: 
 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):
Equities 287 41 
Fixed income 467 66 
Total assets at fair value$1,167 $262 
 2022
Pension BenefitsOther Postretirement Benefits
 Level 1 (1)Level 2 (2)TotalLevel 1 (1)Level 2 (2)Total
 (Millions)
Cash management funds$45 $— $45 $105 $— $105 
Government debt securities58 18 76 11 
Corporate debt securities— 284 284 — 39 39 
Other— — — 
$104 $306 410 $113 $42 155 
Commingled investment funds (3):
Equities273 38 
Fixed income434 60 
Total assets at fair value$1,117 $253 
____________
(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 period restrictions 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)
2024
$95 $12 
2025
96 12 
2026
90 11 
2027
87 11 
2028
84 11 
2029-2033
397 49