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Share-based Compensation and Employee Benefits (Tables) | 12 Months Ended
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Dec. 31, 2018
Employee Benefits and Share-based Compensation, Noncash [Abstract] |
Summary of Activity and Related Balances of Restricted Stock Awards | The following table sets forth a summary of activity and related balances of our restricted stock awards excluding that issued to non-employee directors (in millions, except share and per share amounts):
| Year Ended |  | Year Ended |  | Year Ended
| December 31, 2018 |  | December 31, 2017 |  | December 31, 2016
| Shares |  | Weighted Average Grant Date Fair Value per Share |  | Shares |  | Weighted Average Grant Date Fair Value per Share |  | Shares |  | Weighted Average Grant Date Fair Value per Share
Outstanding at beginning of period | 10,518,344 |  |  | $ | 28.21 |  |  | 9,038,137 |  |  | $ | 32.72 |  |  | 7,645,105 |  |  | $ | 37.91 |
Granted | 5,389,476 |  |  | 17.73 |  |  | 3,221,691 |  |  | 19.52 |  |  | 2,816,599 |  |  | 21.36 |
Vested | (2,371,193 | ) |  | 36.34 |  |  | (1,501,939 | ) |  | 36.67 |  |  | (1,226,652 | ) |  | 38.53 |
Forfeited | (382,022 | ) |  | 23.26 |  |  | (239,545 | ) |  | 28.34 |  |  | (196,915 | ) |  | 35.74 |
Outstanding at end of period | 13,154,605 |  |  | 22.59 |  |  | 10,518,344 |  |  | 28.21 |  |  | 9,038,137 |  |  | 32.72 |
Summary of Future Vesting of Outstanding Restricted Stock Awards | Following is a summary of the future vesting of our outstanding restricted stock awards:
Year |  | Vesting of Restricted Shares
2019 |  | 4,048,963 |
2020 |  | 3,537,544 |
2021 |  | 4,814,403 |
2022 |  | 152,104 |
2023 |  | 121,093 |
Thereafter |  | 480,498 |
Total Outstanding |  | 13,154,605 |
Schedule of Benefit Obligation, Plan Assets and Funded Status | Benefit Obligation, Plan Assets and Funded Status. The following table provides information about our pension and OPEB plans as of and for each of the years ended December 31, 2018 and 2017 (in millions):
| Pension Benefits |  | OPEB
| 2018 |  | 2017 |  | 2018 |  | 2017
Change in benefit obligation: |  |  |  |  |  |  |
Benefit obligation at beginning of period | $ | 2,982 |  |  | $ | 2,884 |  |  | $ | 425 |  |  | $ | 473 |
Service cost | 52 |  |  | 40 |  |  | 1 |  |  | 1 |
Interest cost | 84 |  |  | 88 |  |  | 12 |  |  | 13 |
Actuarial (gain) loss | (172 | ) |  | 155 |  |  | (53 | ) |  | (16 | )
Benefits paid | (175 | ) |  | (180 | ) |  | (33 | ) |  | (38 | )
Participant contributions | — |  |  | 3 |  |  | 1 |  |  | 2 |
Medicare Part D subsidy receipts | — |  |  | — |  |  | 1 |  |  | 1 |
Exchange rate changes | — |  |  | 13 |  |  | — |  |  | 1 |
Settlements | — |  |  | (21 | ) |  | — |  |  | — |
Other(a) | (205 | ) |  | — |  |  | (15 | ) |  | (12 | )
Benefit obligation at end of period | 2,566 |  |  | 2,982 |  |  | 339 |  |  | 425 |
Change in plan assets: |  |  |  |  |  |  |
Fair value of plan assets at beginning of period | 2,296 |  |  | 2,160 |  |  | 335 |  |  | 332 |
Actual return on plan assets | (128 | ) |  | 292 |  |  | (5 | ) |  | 29 |
Employer contributions | 30 |  |  | 32 |  |  | 7 |  |  | 9 |
Participant contributions | — |  |  | 3 |  |  | 1 |  |  | 2 |
Medicare Part D subsidy receipts | — |  |  | — |  |  | 1 |  |  | 1 |
Benefits paid | (175 | ) |  | (180 | ) |  | (33 | ) |  | (38 | )
Exchange rate changes | — |  |  | 10 |  |  | — |  |  | — |
Settlements | — |  |  | (21 | ) |  | — |  |  | — |
Other(a) | (159 | ) |  | — |  |  | — |  |  | — |
Fair value of plan assets at end of period | 1,864 |  |  | 2,296 |  |  | 306 |  |  | 335 |
Funded status - net liability at December 31, | $ | (702 | ) |  | $ | (686 | ) |  | $ | (33 | ) |  | $ | (90 | )
_______
(a) | 2018 amounts represent December 31, 2017 balances associated with Canadian pension and OPEB plans that were included in the TMPL Sale. 2017 amounts represent December 31, 2016 balances associated with our Plantation Pipeline OPEB plan that are no longer included in these disclosures.
Components of Funded Status | Components of Funded Status. The following table details the amounts recognized in our balance sheets at December 31, 2018 and 2017 related to our pension and OPEB plans (in millions):
| Pension Benefits |  | OPEB
| 2018 |  | 2017 |  | 2018 |  | 2017
Non-current benefit asset(a) | $ | — |  |  | $ | — |  |  | $ | 190 |  |  | $ | 198 |
Current benefit liability | — |  |  | — |  |  | (13 | ) |  | (15 | )
Non-current benefit liability | (702 | ) |  | (686 | ) |  | (210 | ) |  | (273 | )
Funded status - net liability at December 31, | $ | (702 | ) |  | $ | (686 | ) |  | $ | (33 | ) |  | $ | (90 | )
_______
(a) | 2018 and 2017 OPEB amounts include $32 million and $33 million, respectively, of non-current benefit assets related to a plan we sponsor which is associated with employee services provided to an unconsolidated joint venture, and for which we have recorded an offsetting related party deferred credit.
Schedule of Components of Accumulated Other Comprehensive (Loss) Income | Components of Accumulated Other Comprehensive (Loss) Income. The following table details the amounts of pre-tax accumulated other comprehensive (loss) income at December 31, 2018 and 2017 related to our pension and OPEB plans which are included on our accompanying consolidated balance sheets, including the portion attributable to our noncontrolling interests, (in millions):
| Pension Benefits |  | OPEB
| 2018 |  | 2017 |  | 2018 |  | 2017
Unrecognized net actuarial (loss) gain | $ | (653 | ) |  | $ | (635 | ) |  | $ | 117 |  |  | $ | 88 |
Unrecognized prior service (cost) credit | (3 | ) |  | (4 | ) |  | 14 |  |  | 17 |
Accumulated other comprehensive (loss) income | $ | (656 | ) |  | $ | (639 | ) |  | $ | 131 |  |  | $ | 105 |
Fair Value of Pension and OPEB Assets by Level of Assets | Listed below are the fair values of our pension and OPEB plans’ assets that are recorded at fair value by class and categorized by fair value measurement used at December 31, 2018 and 2017 (in millions):
| Pension Assets
| 2018 |  | 2017
| Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Measured within fair value hierarchy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 6 |  |  | $ | — |  |  | $ | — |  |  | $ | 6 |
Short-term investment funds | — |  |  | 7 |  |  | — |  |  | 7 |  |  | — |  |  | 65 |  |  | — |  |  | 65 |
Mutual funds(a) | 81 |  |  | — |  |  | — |  |  | 81 |  |  | 245 |  |  | — |  |  | — |  |  | 245 |
Equities(b) | 227 |  |  | — |  |  | — |  |  | 227 |  |  | 278 |  |  | — |  |  | — |  |  | 278 |
Fixed income securities | — |  |  | 422 |  |  | — |  |  | 422 |  |  | — |  |  | 416 |  |  | — |  |  | 416 |
Derivatives | — |  |  | 6 |  |  | — |  |  | 6 |  |  | — |  |  | 5 |  |  | — |  |  | 5 |
Subtotal | $ | 308 |  |  | $ | 435 |  |  | $ | — |  |  | $ | 743 |  |  | $ | 529 |  |  | $ | 486 |  |  | $ | — |  |  | $ | 1,015 |
Measured at NAV(c) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common/collective trusts(d) |  |  |  |  |  |  | 857 |  |  |  |  |  |  |  |  | 895 |
Private investment funds(e) |  |  |  |  |  |  | 215 |  |  |  |  |  |  |  |  | 337 |
Private limited partnerships(f) |  |  |  |  |  |  | 49 |  |  |  |  |  |  |  |  | 49 |
Subtotal |  |  |  |  |  |  |  |  |  | 1,121 |  |  |  |  |  |  |  |  |  |  |  | 1,281 |
Total plan assets fair value |  |  |  |  |  |  |  |  |  | $ | 1,864 |  |  |  |  |  |  |  |  |  |  |  | $ | 2,296 |
_______
(a) | Includes mutual funds which are invested in equity.
(b) | Plan assets include $94 million and $110 million of KMI Class P common stock for 2018 and 2017, respectively.
(c) | Plan assets for which fair value was measured using NAV as a practical expedient.
(d) | Common/collective trust funds were invested in approximately 37% fixed income and 63% equity in 2018 and 36% fixed income and 64% equity in 2017.
(e) | Private investment funds were invested in approximately 71% fixed income and 29% equity in 2018 and 52% fixed income and 48% equity in 2017.
(f) | Includes assets invested in real estate, venture and buyout funds.
| OPEB Assets
| 2018 |  | 2017
| Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Measured within fair value hierarchy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term investment funds | $ | — |  |  | $ | 4 |  |  | $ | — |  |  | $ | 4 |  |  | $ | — |  |  | $ | 7 |  |  | $ | — |  |  | $ | 7 |
Equities(a) | — |  |  | — |  |  | — |  |  | — |  |  | 16 |  |  | — |  |  | — |  |  | 16 |
MLPs | — |  |  | — |  |  | — |  |  | — |  |  | 50 |  |  | — |  |  | — |  |  | 50 |
Guaranteed insurance contracts | — |  |  | — |  |  | 51 |  |  | 51 |  |  | — |  |  | — |  |  | 49 |  |  | 49 |
Mutual funds | 1 |  |  | — |  |  | — |  |  | 1 |  |  | 1 |  |  | — |  |  | — |  |  | 1 |
Subtotal | $ | 1 |  |  | $ | 4 |  |  | $ | 51 |  |  | $ | 56 |  |  | $ | 67 |  |  | $ | 7 |  |  | $ | 49 |  |  | $ | 123 |
Measured at NAV(b) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common/collective trusts(c) |  |  |  |  |  |  | 250 |  |  |  |  |  |  |  |  | 68 |
Fixed income trusts |  |  |  |  |  |  | — |  |  |  |  |  |  |  |  | 66 |
Limited partnerships(d) |  |  |  |  |  |  | — |  |  |  |  |  |  |  |  | 78 |
Subtotal |  |  |  |  |  |  | 250 |  |  |  |  |  |  |  |  | 212 |
Total plan assets fair value |  |  |  |  |  |  |  |  |  | $ | 306 |  |  |  |  |  |  |  |  |  |  |  | $ | 335 |
_______
(a) | Plan assets include $2 million of KMI Class P common stock for 2017.
(b) | Plan assets for which fair value was measured using NAV as a practical expedient.
(c) | Common/collective trust funds were invested in approximately 60% equity and 40% fixed income securities for 2018 and 71% equity and 29% fixed income securities for 2017.
(d) | Limited partnerships were invested in global equity securities.
Schedule of Changes in Plans’ Assets Included in Level 3 | The following tables present the changes in our pension and OPEB plans’ assets included in Level 3 for the years ended December 31, 2018 and 2017 (in millions):
| Pension Assets
| Balance at Beginning of Period |  | Transfers In (Out) |  | Realized and Unrealized Gains (Losses), net |  | Purchases (Sales), net |  | Balance at End of Period
2017 |  |  |  |  |  |  |  |  |
Insurance contracts | $ | 16 |  |  | $ | — |  |  | $ | — |  |  | $ | (16 | ) |  | $ | — |
| OPEB Assets
| Balance at Beginning of Period |  | Transfers In (Out) |  | Realized and Unrealized Gains (Losses), net |  | Purchases (Sales), net |  | Balance at End of Period
2018 |  |  |  |  |  |  |  |  |
Insurance contracts | $ | 49 |  |  | $ | — |  |  | $ | 4 |  |  | $ | (2 | ) |  | $ | 51 |
2017 |  |  |  |  |  |  |  |  |
Insurance contracts | $ | 47 |  |  | $ | — |  |  | $ | 5 |  |  | $ | (3 | ) |  | $ | 49 |
Schedule of Expected Payment of Future Benefits and Employer Contributions | Expected Payment of Future Benefits and Employer Contributions. As of December 31, 2018, we expect to make the following benefit payments under our plans (in millions):
Fiscal year |  | Pension Benefits |  | OPEB(a)
2019 |  | $ | 234 |  |  | $ | 33 |
2020 |  | 233 |  |  | 32 |
2021 |  | 225 |  |  | 32 |
2022 |  | 223 |  |  | 31 |
2023 |  | 214 |  |  | 29 |
2024 - 2028 |  | 969 |  |  | 127 |
_______
(a) | Includes a reduction of approximately $2 million in each of the years 2019 - 2023 and approximately $13 million in aggregate for 2024 - 2028 for an expected subsidy related to the Medicare Prescription Drug, Improvement and Modernization Act of 2003.
Schedule of Weighted-Average Actuarial Assumptions | Actuarial Assumptions and Sensitivity Analysis. Benefit obligations and net benefit cost are based on actuarial estimates and assumptions. The following table details the weighted-average actuarial assumptions used in determining our benefit obligation and net benefit costs of our pension and OPEB plans for 2018, 2017 and 2016:
|  | Pension Benefits |  | OPEB
|  | 2018 |  | 2017 |  | 2016 |  | 2018 |  | 2017 |  | 2016
Assumptions related to benefit obligations: |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  | 4.26 | % |  | 3.56 | % |  | 3.83 | % |  | 4.16 | % |  | 3.48 | % |  | 3.69 | %
Rate of compensation increase |  | 3.50 | % |  | 3.53 | % |  | 3.52 | % |  | n/a |  |  | n/a |  |  | n/a |
Assumptions related to benefit costs: |  |  |  |  |  |  |  |  |  |  |  |
Discount rate for benefit obligations |  | 3.56 | % |  | 3.83 | % |  | 4.05 | % |  | 3.48 | % |  | 3.69 | % |  | 3.91 | %
Discount rate for interest on benefit obligations |  | 3.13 | % |  | 3.09 | % |  | 3.24 | % |  | 3.08 | % |  | 3.05 | % |  | 3.18 | %
Discount rate for service cost |  | 3.56 | % |  | 3.88 | % |  | 4.15 | % |  | 3.82 | % |  | 4.15 | % |  | 4.36 | %
Discount rate for interest on service cost |  | 3.14 | % |  | 3.24 | % |  | 3.50 | % |  | 3.76 | % |  | 3.95 | % |  | 4.17 | %
Expected return on plan assets(a) |  | 7.25 | % |  | 7.07 | % |  | 7.31 | % |  | 7.08 | % |  | 6.84 | % |  | 7.07 | %
Rate of compensation increase |  | 3.50 | % |  | 3.52 | % |  | 3.51 | % |  | n/a |  |  | n/a |  |  | n/a |
_______
(a) | The expected return on plan assets listed in the table above is a pre-tax rate of return based on our targeted portfolio of investments. For the OPEB assets subject to unrelated business income taxes (UBIT), we utilize an after-tax expected return on plan assets to determine our benefit costs, which is based on a UBIT rate of 21% for 2018, 2017 and 2016.
Schedule of One-Percentage Point Change in Assumed Health Care Cost Trends | A one-percentage point change in assumed health care cost trends would have the following effects as of December 31, 2018 and 2017 (in millions):
|  | 2018 |  | 2017
One-percentage point increase: |  |  |  |
Aggregate of service cost and interest cost |  | $ | 1 |  |  | $ | 1 |
Accumulated postretirement benefit obligation |  | 16 |  |  | 22 |
One-percentage point decrease: |  |  |  |
Aggregate of service cost and interest cost |  | $ | (1 | ) |  | $ | (1 | )
Accumulated postretirement benefit obligation |  | (14 | ) |  | (19 | )
Schedule of Components of Net Benefit Cost and Other Amounts Recognized in Other Comprehensive Income | Components of Net Benefit Cost and Other Amounts Recognized in Other Comprehensive Income. For each of the years ended December 31, the components of net benefit cost and other amounts recognized in pre-tax other comprehensive income related to our pension and OPEB plans are as follows (in millions):
|  | Pension Benefits |  | OPEB
|  | 2018 |  | 2017 |  | 2016 |  | 2018 |  | 2017 |  | 2016
Components of net benefit cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 52 |  |  | $ | 40 |  |  | $ | 36 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |
Interest cost |  | 84 |  |  | 88 |  |  | 89 |  |  | 12 |  |  | 13 |  |  | 16 |
Expected return on assets |  | (149 | ) |  | (147 | ) |  | (151 | ) |  | (20 | ) |  | (19 | ) |  | (19 | )
Amortization of prior service cost (credit) |  | — |  |  | 1 |  |  | 1 |  |  | (4 | ) |  | (3 | ) |  | (3 | )
Amortization of net actuarial loss (gain) |  | 40 |  |  | 52 |  |  | 35 |  |  | (6 | ) |  | (6 | ) |  | — |
Curtailment and settlement loss |  | — |  |  | 5 |  |  | — |  |  | — |  |  | — |  |  | — |
Net benefit (credit) cost(a) |  | 27 |  |  | 39 |  |  | 10 |  |  | (17 | ) |  | (14 | ) |  | (5 | )
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss: |  |  |  |  |  |  |  |  |  |  |  |
Net loss (gain) arising during period |  | 105 |  |  | 17 |  |  | 116 |  |  | (32 | ) |  | (25 | ) |  | (48 | )
Prior service cost (credit) arising during period |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization or settlement recognition of net actuarial (loss) gain |  | (87 | ) |  | (64 | ) |  | (34 | ) |  | 3 |  |  | 6 |  |  | — |
Amortization of prior service (cost) credit |  | (1 | ) |  | (1 | ) |  | — |  |  | 3 |  |  | 1 |  |  | 1 |
Exchange rate changes |  | — |  |  | — |  |  | 1 |  |  | — |  |  | — |  |  | — |
Total recognized in total other comprehensive (income) loss |  | 17 |  |  | (48 | ) |  | 83 |  |  | (26 | ) |  | (18 | ) |  | (47 | )
Total recognized in net benefit cost (credit) and other comprehensive (income) loss |  | $ | 44 |  |  | $ | (9 | ) |  | $ | 93 |  |  | $ | (43 | ) |  | $ | (32 | ) |  | $ | (52 | )
_______
(a) | 2018 and 2017 OPEB amounts each include $4 million of net benefit credits related to a plan that we sponsor that is associated with employee services provided to an unconsolidated joint venture. We charge or refund these costs or credits associated with this plan to the joint venture as an offset to our net benefit cost or credit and receive our proportionate share of these costs or credits through our share of the equity investee’s earnings.

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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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