XML 104 R83.htm IDEA: XBRL DOCUMENT v3.25.0.1
Share-based Compensation and Employee Benefits - Fair Value of Pension and OPEB Assets by Level of Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value $ 1,614 $ 1,562 $ 1,741
Pension Benefits | Total      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 583 585  
Pension Benefits | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 203 143  
Pension Benefits | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 380 442  
Pension Benefits | Measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 1,031 977  
Pension Benefits | Short-term Investment Funds | Total      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 0 32  
Pension Benefits | Short-term Investment Funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 0 0  
Pension Benefits | Short-term Investment Funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 0 32  
Pension Benefits | Short-term Investment Funds | Measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 29 0  
Pension Benefits | Equities | Total      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 203 143  
Pension Benefits | Equities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 203 143  
Pension Benefits | Equities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 0 0  
Pension Benefits | Fixed Income Securities | Total      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 380 410  
Pension Benefits | Fixed Income Securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 0 0  
Pension Benefits | Fixed Income Securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 380 410  
Pension Benefits | Common/Collective Trusts | Measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value $ 1,002 $ 976  
Pension Benefits | Common/Collective Trusts Invested in Equity Securities | Measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of category allocated to investments 66.00% 64.00%  
Pension Benefits | Common/Collective Trusts Invested in Fixed Income Securities | Measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of category allocated to investments 22.00% 23.00%  
Pension Benefits | Common/Collective Trusts Invested in Real Estate | Measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of category allocated to investments 12.00% 13.00%  
Pension Benefits | Private Limited Partnerships | Measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value $ 0 $ 1  
OPEB      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 331 323 $ 302
OPEB | Short-term Investment Funds | Total      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 3 5  
OPEB | Short-term Investment Funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 0 0  
OPEB | Short-term Investment Funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 3 5  
OPEB | Common/Collective Trusts | Measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value $ 328 $ 318  
OPEB | Common/Collective Trusts Invested in Equity Securities | Measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of category allocated to investments 62.00% 62.00%  
OPEB | Common/Collective Trusts Invested in Fixed Income Securities | Measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of category allocated to investments 38.00% 38.00%  
Class P | Pension Benefits | Equities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Amount of KMI securities invested in $ 167 $ 107