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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | $ 2,076 | $ 1,864 | $ 2,296
Pension Benefits | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 763 | 743 |
Pension Benefits | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 296 | 308 |
Pension Benefits | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 467 | 435 |
Pension Benefits | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
Pension Benefits | Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 1,313 | 1,121 |
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 | 50 | 7 |
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 | 50 | 7 |
Pension Benefits | Short-term Investment Funds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
Pension Benefits | Mutual Funds | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 81 |
Pension Benefits | Mutual Funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 81 |
Pension Benefits | Mutual Funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
Pension Benefits | Mutual Funds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
Pension Benefits | Equities | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 296 | 227 |
Pension Benefits | Equities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 296 | 227 |
Pension Benefits | Equities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
Pension Benefits | Equities | Level 3 |  |  |
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 | 405 | 422 |
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 | 405 | 422 |
Pension Benefits | Fixed Income Securities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
Pension Benefits | Derivatives | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 12 | 6 |
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 | 12 | 6 |
Pension Benefits | Derivatives | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
Pension Benefits | Common/Collective Trusts | Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | $ 1,069 | $ 857 |
Pension Benefits | Common/Collective Trusts Invested in Equity Securities | Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of category allocated to investments | 68.00% | 63.00% |
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 | 32.00% | 37.00% |
Pension Benefits | Private Investment Funds | Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | $ 200 | $ 215 |
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 | 73.00% | 71.00% |
Pension Benefits | Private Investment Funds Invested in Equity Securities | Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of category allocated to investments | 27.00% | 29.00% |
Pension Benefits | Private Limited Partnerships | Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | $ 44 | $ 49 |
OPEB |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 333 | 306 | 335
OPEB | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 59 | 56 |
OPEB | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 37 | 1 |
OPEB | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 22 | 4 |
OPEB | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 51 |
OPEB | Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 274 | 250 |
OPEB | Cash | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 1 | 0 |
OPEB | Cash | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 1 | 0 |
OPEB | Cash | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
OPEB | Cash | Level 3 |  |  |
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 | 4 |
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 | 4 |
OPEB | Short-term Investment Funds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
OPEB | Mutual Funds | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 11 | 1 |
OPEB | Mutual Funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 11 | 1 |
OPEB | Mutual Funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
OPEB | Mutual Funds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
OPEB | Equities | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 25 | 0 |
OPEB | Equities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 25 | 0 |
OPEB | Equities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
OPEB | Equities | Level 3 |  |  |
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 | 17 | 0 |
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 | 17 | 0 |
OPEB | Fixed Income Securities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
OPEB | Guaranteed Insurance Contracts | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 51 |
OPEB | Guaranteed Insurance Contracts | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
OPEB | Guaranteed Insurance Contracts | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
OPEB | Guaranteed Insurance Contracts | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 51 | $ 49
OPEB | Common/Collective Trusts | Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | $ 274 | $ 250 |
OPEB | Common/Collective Trusts Invested in Equity Securities | Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of category allocated to investments | 64.00% | 60.00% |
OPEB | Common/Collective Trusts Invested in Fixed Income Securities | Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of category allocated to investments | 36.00% | 40.00% |
Class P | Pension Benefits | Equities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amount of KMI securities invested in | $ 129 | $ 94 |
Class P | Pension Benefits | Fixed Income Securities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amount of KMI securities invested in | $ 1 |  |

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