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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value $ 2,199 $ 2,076 $ 1,864
Pension Benefits | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 762 763  
Pension Benefits | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 249 296  
Pension Benefits | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 513 467  
Pension Benefits | Measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 1,437 1,313  
Pension Benefits | Short-term Investment Funds | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 77 50  
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 77 50  
Pension Benefits | Equities | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 249 296  
Pension Benefits | Equities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 249 296  
Pension Benefits | Equities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 0 0  
Pension Benefits | Fixed Income Securities | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 425 405  
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 425 405  
Amount of KMI securities invested in 1 1  
Pension Benefits | Derivatives | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 11 12  
Pension Benefits | Derivatives | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 0 0  
Pension Benefits | Derivatives | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 11 12  
Pension Benefits | Common/Collective Trusts | Measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value $ 1,184 $ 1,069  
Pension Benefits | Common/Collective Trusts Invested in Equity Securities | Measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of category allocated to investments 71.00% 68.00%  
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 29.00% 32.00%  
Pension Benefits | Private Investment Funds | Measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value $ 208 $ 200  
Pension Benefits | Private Investment Funds Invested in Fixed Income Securities | Measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of category allocated to investments 71.00% 73.00%  
Pension Benefits | Private Investment Funds Invested in Equity Securities | Measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of category allocated to investments 29.00% 27.00%  
Pension Benefits | Private Limited Partnerships | Measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value $ 45 $ 44  
OPEB      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 361 333 $ 306
OPEB | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 5 59  
OPEB | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 0 37  
OPEB | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 5 22  
OPEB | Measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 356 274  
OPEB | Cash | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 0 1  
OPEB | Cash | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 0 1  
OPEB | Cash | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 0 0  
OPEB | Short-term Investment Funds | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 5 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 5 5  
OPEB | Equities | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 0 25  
OPEB | Equities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 0 25  
OPEB | Equities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 0 0  
OPEB | Fixed Income Securities | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 0 17  
OPEB | Fixed Income Securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 0 0  
OPEB | Fixed Income Securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 0 17  
OPEB | Mutual Funds | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 0 11  
OPEB | Mutual Funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 0 11  
OPEB | Mutual Funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value 0 0  
OPEB | Common/Collective Trusts | Measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets fair value $ 356 $ 274  
OPEB | Common/Collective Trusts Invested in Equity Securities | Measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of category allocated to investments 65.00% 64.00%  
OPEB | Common/Collective Trusts Invested in Fixed Income Securities | Measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of category allocated to investments 35.00% 36.00%  
Class P | Pension Benefits | Equities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Amount of KMI securities invested in $ 83 $ 129