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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Pension Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | $ 1,864 | $ 2,296 | $ 2,160
Pension Benefits [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 743 | 1,015 |
Pension Benefits [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 308 | 529 |
Pension Benefits [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 435 | 486 |
Pension Benefits [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
Pension Benefits [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 1,121 | 1,281 |
Pension Benefits [Member] | Cash [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 6 |
Pension Benefits [Member] | Cash [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 6 |
Pension Benefits [Member] | Cash [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
Pension Benefits [Member] | Cash [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
Pension Benefits [Member] | Short-term Investment Funds [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 7 | 65 |
Pension Benefits [Member] | Short-term Investment Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
Pension Benefits [Member] | Short-term Investment Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 7 | 65 |
Pension Benefits [Member] | Short-term Investment Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
Pension Benefits [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 227 | 278 |
Pension Benefits [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 227 | 278 |
Pension Benefits [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
Pension Benefits [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
Pension Benefits [Member] | Guaranteed Insurance Contracts [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value |  | 0 | 16
Pension Benefits [Member] | Mutual Funds [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 81 | 245 |
Pension Benefits [Member] | Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 81 | 245 |
Pension Benefits [Member] | Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
Pension Benefits [Member] | Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
Pension Benefits [Member] | Fixed Income Securities [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 422 | 416 |
Pension Benefits [Member] | Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
Pension Benefits [Member] | Fixed Income Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 422 | 416 |
Pension Benefits [Member] | Fixed Income Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
Pension Benefits [Member] | Derivatives [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 6 | 5 |
Pension Benefits [Member] | Derivatives [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
Pension Benefits [Member] | Derivatives [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 6 | 5 |
Pension Benefits [Member] | Derivatives [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
Pension Benefits [Member] | Defined Benefit Plan, Common Collective Trust [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | $ 857 | $ 895 |
Pension Benefits [Member] | Common Collective Trusts Invested in Equity Securities [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of category allocated to investments | 63.00% | 64.00% |
Pension Benefits [Member] | Common Collective Trusts Invested in Fixed Income Securities [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of category allocated to investments | 37.00% | 36.00% |
Pension Benefits [Member] | Private Equity Funds [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | $ 215 | $ 337 |
Pension Benefits [Member] | Private Equity Funds Invested in Fixed Income Securities [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of category allocated to investments | 71.00% | 52.00% |
Pension Benefits [Member] | Private Equity Funds Invested in Equity Securities [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of category allocated to investments | 29.00% | 48.00% |
Pension Benefits [Member] | Limited Partnership [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | $ 49 | $ 49 |
OPEB [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 306 | 335 | 332
OPEB [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 56 | 123 |
OPEB [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 1 | 67 |
OPEB [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 4 | 7 |
OPEB [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 51 | 49 |
OPEB [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 250 | 212 |
OPEB [Member] | Short-term Investment Funds [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 4 | 7 |
OPEB [Member] | Short-term Investment Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
OPEB [Member] | Short-term Investment Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 4 | 7 |
OPEB [Member] | Short-term Investment Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
OPEB [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 16 |
OPEB [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 16 |
OPEB [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
OPEB [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
OPEB [Member] | Master Limited Partnerships [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 50 |
OPEB [Member] | Master Limited Partnerships [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 50 |
OPEB [Member] | Master Limited Partnerships [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
OPEB [Member] | Master Limited Partnerships [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
OPEB [Member] | Guaranteed Insurance Contracts [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 51 | 49 |
OPEB [Member] | Guaranteed Insurance Contracts [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
OPEB [Member] | Guaranteed Insurance Contracts [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
OPEB [Member] | Guaranteed Insurance Contracts [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 51 | 49 | $ 47
OPEB [Member] | Mutual Funds [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 1 | 1 |
OPEB [Member] | Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 1 | 1 |
OPEB [Member] | Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
OPEB [Member] | Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 0 |
OPEB [Member] | Defined Benefit Plan, Common Collective Trust [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | $ 250 | $ 68 |
OPEB [Member] | Common Collective Trusts Invested in Equity Securities [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of category allocated to investments | 60.00% | 71.00% |
OPEB [Member] | Common Collective Trusts Invested in Fixed Income Securities [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of category allocated to investments | 40.00% | 29.00% |
OPEB [Member] | Fixed Income Trusts [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | $ 0 | $ 66 |
OPEB [Member] | Limited Partnership [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total plan assets fair value | 0 | 78 |
Class P | Pension Benefits [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amount of KMI securities invested in | $ 94 | 110 |
Class P | OPEB [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amount of KMI securities invested in |  | $ 2 |

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