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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