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Share-based Compensation and Employee Benefits - Fair Value of Pension and OPEB Assets by Level of Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value $ 1,562 $ 1,741 $ 2,231
Pension Benefits | Total      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 585 600  
Pension Benefits | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 143 152  
Pension Benefits | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 442 448  
Pension Benefits | Measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 977 1,141  
Pension Benefits | Short-term Investment Funds | Total      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 32 27  
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 32 27  
Pension Benefits | Equities | Total      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 143 152  
Pension Benefits | Equities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 143 152  
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 410 421  
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 410 421  
Pension Benefits | Common/Collective Trusts | Measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value $ 976 $ 1,138  
Pension Benefits | Common/Collective Trusts Invested in Equity Securities | Measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of category allocated to investments 64.00% 66.00%  
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 23.00% 22.00%  
Pension Benefits | Common/Collective Trusts Invested in Real Estate | Measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of category allocated to investments 13.00% 12.00%  
Pension Benefits | Private Limited Partnerships | Measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value $ 1 $ 3  
OPEB      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 323 302 $ 382
OPEB | Short-term Investment Funds | Total      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 5 3  
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 5 3  
OPEB | Common/Collective Trusts | Measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value $ 318 $ 299  
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% 61.00%  
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% 39.00%  
Class P | Pension Benefits | Equities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Amount of KMI securities invested in $ 107 $ 110