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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2022
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
 2022202120222021
 (Millions)
Change in benefit obligation:
Benefit obligation at beginning of year
$1,133 $1,183 $200 $220 
Service cost
28 30 1 1 
Interest cost
31 28 6 5 
Plan participants’ contributions
— — 2 2 
Benefits paid
(78)(83)(12)(14)
Net actuarial loss (gain) (1)(162)(21)(45)(14)
Settlements
(12)(4)— — 
Net increase (decrease) in benefit obligation(193)(50)(48)(20)
Benefit obligation at end of year
940 1,133 152 200 
Change in plan assets:
Fair value of plan assets at beginning of year
1,336 1,357 287 278 
Actual return on plan assets
(132)62 (27)16 
Employer contributions
3 4 3 5 
Plan participants’ contributions
— — 2 2 
Benefits paid
(78)(83)(12)(14)
Settlements
(12)(4)— — 
Net increase (decrease) in fair value of plan assets(219)(21)(34)9 
Fair value of plan assets at end of year
1,117 1,336 253 287 
Funded status — overfunded (underfunded)$177 $203 $101 $87 
Amounts recognized in the Consolidated Balance Sheet:
Noncurrent assets$201 $229 $105 $91 
Current liabilities(2)(3)(4)(4)
Noncurrent liabilities(22)(23)— — 
Funded status — overfunded (underfunded)$177 $203 $101 $87 
Accumulated benefit obligation$930 $1,118 
____________
(1)    2022 amounts are due primarily to the following factors: Pension benefits - discount rate assumptions, partially offset by change in interest crediting rate assumption; Other Postretirement Benefits - discount rate assumption. 2021 amounts are due primarily to the following factors: Pension Benefits - discount rate assumptions, partially offset by experience-related items; Other Postretirement Benefits - discount rate assumption and experience-related items.
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.
 20222021
 (Millions)
Projected benefit obligation$24 $26 
Accumulated benefit obligation22 22 
Fair value of plan assets— — 
Pre-tax amounts recognized in Accumulated other comprehensive income (loss)[Table Text Block]
Pre-tax amounts recognized in Accumulated other comprehensive income (loss) at December 31 are as follows:
 Pension BenefitsOther
Postretirement Benefits
 2022202120222021
 (Millions)
Net actuarial gain (loss)$(45)$(46)$18 $4 
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
 202220212020202220212020
 (Millions)
Components of net periodic benefit cost (credit):
Service cost
$28 $30 $31 $1 $1 $1 
Interest cost
31 28 36 6 5 7 
Expected return on plan assets
(44)(43)(53)(10)(10)(11)
Amortization of net actuarial loss
12 14 21 — — — 
Net actuarial loss from settlements
3 1 9 — — — 
Reclassification to regulatory liability
— — — 1 2 2 
Net periodic benefit cost (credit) (1)$30 $30 $44 $(2)$(2)$(1)
____________
(1)    Components other than Service cost are included in Other income (expense) – net below Operating income (loss) in the Consolidated Statement of Income.
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss) [Table Text Block]
Other changes in plan assets and benefit obligations recognized in Other comprehensive income (loss) before taxes for the years ended December 31 consist of the following:
 Pension BenefitsOther
Postretirement  Benefits
 202220212020202220212020
 (Millions)
Net actuarial gain (loss) arising during the year$(14)$40 $112 $14 $29 $(4)
Amortization of net actuarial loss12 14 21 — — — 
Net actuarial loss from settlements3 1 9 — — — 
Total recognized in Other comprehensive income (loss)
$1 $55 $142 $14 $29 $(4)
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
 202220212020202220212020
Benefit obligations:
Discount rate5.16 %2.82 %2.45 %5.20 %2.93 %2.59 %
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
Net periodic benefit cost (credit):
Discount rate2.84 %2.45 %3.08 %2.93 %2.59 %3.27 %
Expected long-term rate of return on plan assets3.81 3.69 4.67 3.67 3.61 4.39 
Rate of compensation increase3.67 3.76 3.68 N/AN/AN/A
Cash balance interest crediting rate3.00 3.00 3.50 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: 
 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 8 3 11 
Corporate debt securities— 284 284 — 39 39 
Other1 4 5 — — — 
$104 $306 410 $113 $42 155 
Commingled investment funds (3):
Equities 273 38 
Fixed income 434 60 
Total assets at fair value$1,117 $253 
 2021
Pension BenefitsOther Postretirement Benefits
 Level 1 (1)Level 2 (2)TotalLevel 1 (1)Level 2 (2)Total
 (Millions)
Cash management funds$37 $— $37 $14 $— $14 
Equity securities42 19 61 39 10 49 
Government debt securities99 28 127 13 4 17 
Corporate debt securities— 350 350 — 47 47 
Mutual fund - Municipal bonds— — — 59 — 59 
Other(3)2 (1)(1)— (1)
$175 $399 574 $124 $61 185 
Commingled investment funds (3):
Equities288 39 
Fixed income474 63 
Total assets at fair value$1,336 $287 
____________
(1)    Level 1 includes assets with fair values based on quoted prices in active markets for identical assets. Cash management funds, equity securities traded on U.S. exchanges, U.S. Treasury securities, and mutual funds are included in this level.
(2)    Level 2 includes assets with fair values determined by using significant other observable inputs. This level includes equity securities traded on active foreign exchanges and 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)
2023$84 $13 
202483 13 
202584 12 
202681 12 
202780 11 
2028-2032389 52