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Share-based Compensation and Employee Benefits Share-based Compensation and Employee Benefits (Tables) | 12 Months Ended
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Dec. 31, 2017
Share-based Compensation [Abstract] |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] | 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, 2017 |  | December 31, 2016 |  | December 31, 2015
| Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value
Outstanding at beginning of period | 9,038,137 |  |  | $ | 32.72 |  |  | 7,645,105 |  |  | $ | 37.91 |  |  | 7,373,294 |  |  | $ | 37.63 |
Granted | 3,221,691 |  |  | 19.52 |  |  | 2,816,599 |  |  | 21.36 |  |  | 1,488,467 |  |  | 38.20 |
Vested | (1,501,939 | ) |  | 36.67 |  |  | (1,226,652 | ) |  | 38.53 |  |  | (817,797 | ) |  | 35.66 |
Forfeited | (239,545 | ) |  | 28.34 |  |  | (196,915 | ) |  | 35.74 |  |  | (398,859 | ) |  | 38.51 |
Outstanding at end of period | 10,518,344 |  |  | $ | 28.21 |  |  | 9,038,137 |  |  | $ | 32.72 |  |  | 7,645,105 |  |  | $ | 37.91 |
Share-based Compensation Arrangements by Share-based Payment Award, Restricted Stock Units, Vested and Expected to Vest [Table Text Block] | Following is a summary of the future vesting of our outstanding restricted stock awards:
Year |  | Vesting of Restricted Shares
2018 |  | 2,272,019 |
2019 |  | 4,268,118 |
2020 |  | 3,647,967 |
2021 |  | 199,850 |
2022 |  | 65,928 |
Thereafter |  | 64,462 |
Total Outstanding |  | 10,518,344 |
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block] | 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, 2017 and 2016 (in millions):
| Pension Benefits |  | OPEB
| 2017 |  | 2016 |  | 2017 |  | 2016
Change in benefit obligation: |  |  |  |  |  |  |
Benefit obligation at beginning of period | $ | 2,884 |  |  | $ | 2,654 |  |  | $ | 473 |  |  | $ | 509 |
Service cost | 40 |  |  | 36 |  |  | 1 |  |  | 1 |
Interest cost | 88 |  |  | 89 |  |  | 13 |  |  | 16 |
Actuarial loss (gain) | 155 |  |  | 127 |  |  | (16 | ) |  | (42 | )
Benefits paid | (180 | ) |  | (180 | ) |  | (38 | ) |  | (41 | )
Participant contributions | 3 |  |  | 3 |  |  | 2 |  |  | 2 |
Medicare Part D subsidy receipts | — |  |  | — |  |  | 1 |  |  | 1 |
Exchange rate changes | 13 |  |  | 4 |  |  | 1 |  |  | 1 |
Settlements | (21 | ) |  | — |  |  | — |  |  | — |
Other(a) | — |  |  | 151 |  |  | (12 | ) |  | 26 |
Benefit obligation at end of period | 2,982 |  |  | 2,884 |  |  | 425 |  |  | 473 |
Change in plan assets: |  |  |  |  |  |  |
Fair value of plan assets at beginning of period | 2,160 |  |  | 2,050 |  |  | 332 |  |  | 325 |
Actual return on plan assets | 292 |  |  | 157 |  |  | 29 |  |  | 29 |
Employer contributions | 32 |  |  | 8 |  |  | 9 |  |  | 16 |
Participant contributions | 3 |  |  | 3 |  |  | 2 |  |  | 2 |
Medicare Part D subsidy receipts | — |  |  | — |  |  | 1 |  |  | 1 |
Benefits paid | (180 | ) |  | (180 | ) |  | (38 | ) |  | (41 | )
Exchange rate changes | 10 |  |  | 3 |  |  | — |  |  | — |
Settlements | (21 | ) |  | — |  |  | — |  |  | — |
Other(a) | — |  |  | 119 |  |  | — |  |  | — |
Fair value of plan assets at end of period | 2,296 |  |  | 2,160 |  |  | 335 |  |  | 332 |
Funded status - net liability at December 31, | $ | (686 | ) |  | $ | (724 | ) |  | $ | (90 | ) |  | $ | (141 | )
_______
(a) | 2017 amounts represent December 31, 2016 balances associated with our Plantation Pipeline OPEB plan that are no longer included in these disclosures. 2016 amounts primarily represent December 31, 2015 balances associated with our Canadian pension and OPEB plans for prospective inclusion in these disclosures, which associated net periodic benefit costs were reported separately in years prior to 2016.
Schedule of Net Funded Status [Table Text Block] | Components of Funded Status. The following table details the amounts recognized in our balance sheets at December 31, 2017 and 2016 related to our pension and OPEB plans (in millions):
| Pension Benefits |  | OPEB
| 2017 |  | 2016 |  | 2017 |  | 2016
Non-current benefit asset(a) | $ | — |  |  | $ | — |  |  | $ | 198 |  |  | $ | 153 |
Current benefit liability | — |  |  | — |  |  | (15 | ) |  | (16 | )
Non-current benefit liability | (686 | ) |  | (724 | ) |  | (273 | ) |  | (278 | )
Funded status - net liability at December 31, | $ | (686 | ) |  | $ | (724 | ) |  | $ | (90 | ) |  | $ | (141 | )
_______
(a) | 2017 and 2016 OPEB amounts include $33 million and $29 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 Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] | Components of Accumulated Other Comprehensive (Loss) Income. The following table details the amounts of pre-tax accumulated other comprehensive (loss) income at December 31, 2017 and 2016 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
| 2017 |  | 2016 |  | 2017 |  | 2016
Unrecognized net actuarial (loss) gain | $ | (635 | ) |  | $ | (682 | ) |  | $ | 88 |  |  | $ | 69 |
Unrecognized prior service (cost) credit | (4 | ) |  | (5 | ) |  | 17 |  |  | 18 |
Accumulated other comprehensive (loss) income | $ | (639 | ) |  | $ | (687 | ) |  | $ | 105 |  |  | $ | 87 |
Fair value of Pension and OPEB assets by level of assets [Table Text Block] | 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, 2017 and 2016 (in millions):
| Pension Assets
| 2017 |  | 2016
| Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Measured within fair value hierarchy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | $ | 6 |  |  | $ | — |  |  | $ | — |  |  | $ | 6 |  |  | $ | 10 |  |  | $ | — |  |  | $ | — |  |  | $ | 10 |
Short-term investment funds | — |  |  | 65 |  |  | — |  |  | 65 |  |  | — |  |  | 100 |  |  | — |  |  | 100 |
Mutual funds(a) | 245 |  |  | — |  |  | — |  |  | 245 |  |  | 197 |  |  | — |  |  | — |  |  | 197 |
Equities(b) | 278 |  |  | — |  |  | — |  |  | 278 |  |  | 283 |  |  | — |  |  | — |  |  | 283 |
Fixed income securities(c) | — |  |  | 416 |  |  | — |  |  | 416 |  |  | — |  |  | 428 |  |  | — |  |  | 428 |
Immediate participation guarantee contract | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 16 |  |  | 16 |
Derivatives | — |  |  | 5 |  |  | — |  |  | 5 |  |  | — |  |  | (2 | ) |  | — |  |  | (2 | )
Subtotal | $ | 529 |  |  | $ | 486 |  |  | $ | — |  |  | 1,015 |  |  | $ | 490 |  |  | $ | 526 |  |  | $ | 16 |  |  | 1,032 |
Measured at NAV(d) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common/collective trusts(e) |  |  |  |  |  |  | 895 |  |  |  |  |  |  |  |  | 829 |
Private investment funds(f) |  |  |  |  |  |  | 337 |  |  |  |  |  |  |  |  | 290 |
Private limited partnerships(g) |  |  |  |  |  |  | 49 |  |  |  |  |  |  |  |  | 9 |
Subtotal |  |  |  |  |  |  |  |  |  | 1,281 |  |  |  |  |  |  |  |  |  |  |  | 1,128 |
Total plan assets fair value |  |  |  |  |  |  |  |  |  | $ | 2,296 |  |  |  |  |  |  |  |  |  |  |  | $ | 2,160 |
_______
(a) | Includes mutual funds which are invested in equity.
(b) | Plan assets include $110 million and $126 million of KMI Class P common stock for 2017 and 2016, respectively.
(c) | For 2016, plan assets include $1 million of KMI debt securities.
(d) | Plan assets for which fair value was measured using NAV as a practical expedient.
(e) | Common/collective trust funds were invested in approximately 36% fixed income and 64% equity in 2017 and 39% fixed income and 61% equity in 2016.
(f) | Private investment funds were invested in approximately 52% fixed income and 48% equity in 2017 and 54% fixed income and 46% equity in 2016.
(g) | Includes assets invested in real estate, venture and buyout funds. 2016 also includes high yield investments.
| OPEB Assets
| 2017 |  | 2016
| Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Measured within fair value hierarchy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term investment funds | $ | — |  |  | $ | 7 |  |  | $ | — |  |  | $ | 7 |  |  | $ | — |  |  | $ | 15 |  |  | $ | — |  |  | $ | 15 |
Equities(a) | 16 |  |  | — |  |  | — |  |  | 16 |  |  | 11 |  |  | — |  |  | — |  |  | 11 |
MLPs | 50 |  |  | — |  |  | — |  |  | 50 |  |  | 57 |  |  | — |  |  | — |  |  | 57 |
Guaranteed insurance contracts | — |  |  | — |  |  | 49 |  |  | 49 |  |  | — |  |  | — |  |  | 47 |  |  | 47 |
Mutual funds | 1 |  |  | — |  |  | — |  |  | 1 |  |  | 1 |  |  | — |  |  | — |  |  | 1 |
Subtotal | $ | 67 |  |  | $ | 7 |  |  | $ | 49 |  |  | 123 |  |  | $ | 69 |  |  | $ | 15 |  |  | $ | 47 |  |  | 131 |
Measured at NAV(b) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common/collective trusts(c) |  |  |  |  |  |  | 68 |  |  |  |  |  |  |  |  | 68 |
Fixed income trusts |  |  |  |  |  |  | 66 |  |  |  |  |  |  |  |  | 64 |
Limited partnerships(d) |  |  |  |  |  |  | 78 |  |  |  |  |  |  |  |  | 69 |
Subtotal |  |  |  |  |  |  | 212 |  |  |  |  |  |  |  |  | 201 |
Total plan assets fair value |  |  |  |  |  |  |  |  |  | $ | 335 |  |  |  |  |  |  |  |  |  |  |  | $ | 332 |
_______
(a) | Plan assets include $2 million of KMI Class P common stock for each 2017 and 2016.
(b) | Plan assets for which fair value was measured using NAV as a practical expedient.
(c) | Common/collective trust funds were invested in approximately 71% equity and 29% fixed income securities for 2017 and 72% equity and 28% fixed income securities for 2016.
(d) | Limited partnerships were invested in global equity securities.
Schedule of Changes in Accumulated Postemployment Benefit Obligations [Table Text Block] | The following tables present the changes in our pension and OPEB plans’ assets included in Level 3 for the years ended December 31, 2017 and 2016 (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 | ) |  | $ | — |
2016 |  |  |  |  |  |  |  |  |
Insurance contracts | $ | 15 |  |  | $ | — |  |  | $ | 1 |  |  | $ | — |  |  | $ | 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
2017 |  |  |  |  |  |  |  |  |
Insurance contracts | $ | 47 |  |  | $ | — |  |  | $ | 5 |  |  | $ | (3 | ) |  | $ | 49 |
2016 |  |  |  |  |  |  |  |  |
Insurance contracts | $ | 49 |  |  | $ | — |  |  | $ | (2 | ) |  | $ | — |  |  | $ | 47 |
Changes in the underlying value of Level 3 assets due to the effect of changes of fair value were immaterial for the years ended December 31, 2017 and 2016.
Schedule of Expected Benefit Payments [Table Text Block] | Expected Payment of Future Benefits and Employer Contributions. As of December 31, 2017, we expect to make the following benefit payments under our plans (in millions):
Fiscal year |  | Pension Benefits |  | OPEB(a)
2018 |  | $ | 244 |  |  | $ | 36 |
2019 |  | 241 |  |  | 36 |
2020 |  | 242 |  |  | 35 |
2021 |  | 232 |  |  | 34 |
2022 |  | 230 |  |  | 33 |
2023 - 2027 |  | 1,029 |  |  | 149 |
_______
(a) | Includes a reduction of approximately $2 million in each of the years 2018 - 2022 and approximately $13 million in aggregate for 2023 - 2027 for an expected subsidy related to the Medicare Prescription Drug, Improvement and Modernization Act of 2003.
Schedule of Assumptions Used [Table Text Block] | 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 2017, 2016 and 2015:
|  | Pension Benefits |  | OPEB
|  | 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
Assumptions related to benefit obligations: |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  | 3.56 | % |  | 3.83 | % |  | 4.05 | % |  | 3.48 | % |  | 3.69 | % |  | 3.91 | %
Rate of compensation increase |  | 3.53 | % |  | 3.52 | % |  | 3.50 | % |  | n/a |  |  | n/a |  |  | n/a |
Assumptions related to benefit costs: |  |  |  |  |  |  |  |  |  |  |  |
Discount rate for benefit obligations |  | 3.83 | % |  | 4.05 | % |  | 3.66 | % |  | 3.69 | % |  | 3.91 | % |  | 3.56 | %
Discount rate for interest on benefit obligations |  | 3.09 | % |  | 3.24 | % |  | 3.66 | % |  | 3.05 | % |  | 3.18 | % |  | 3.56 | %
Discount rate for service cost |  | 3.88 | % |  | 4.15 | % |  | 3.66 | % |  | 4.15 | % |  | 4.36 | % |  | 3.56 | %
Discount rate for interest on service cost |  | 3.24 | % |  | 3.50 | % |  | 3.66 | % |  | 3.95 | % |  | 4.17 | % |  | 3.56 | %
Expected return on plan assets(a) |  | 7.07 | % |  | 7.31 | % |  | 7.50 | % |  | 6.84 | % |  | 7.07 | % |  | 7.08 | %
Rate of compensation increase |  | 3.52 | % |  | 3.51 | % |  | 4.50 | % |  | 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 2017, 2016 and 2015.
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block] | A one-percentage point change in assumed health care cost trends would have the following effects as of December 31, 2017 and 2016 (in millions):
|  | 2017 |  | 2016
One-percentage point increase: |  |  |  |
Aggregate of service cost and interest cost |  | $ | 1 |  |  | $ | 1 |
Accumulated postretirement benefit obligation |  | 22 |  |  | 27 |
One-percentage point decrease: |  |  |  |
Aggregate of service cost and interest cost |  | $ | (1 | ) |  | $ | (1 | )
Accumulated postretirement benefit obligation |  | (19 | ) |  | (23 | )
Schedule of Net Benefit Costs [Table Text Block] | 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
|  | 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
Components of net benefit cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 40 |  |  | $ | 36 |  |  | $ | 33 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | — |
Interest cost |  | 88 |  |  | 89 |  |  | 99 |  |  | 13 |  |  | 16 |  |  | 21 |
Expected return on assets |  | (147 | ) |  | (151 | ) |  | (172 | ) |  | (19 | ) |  | (19 | ) |  | (23 | )
Amortization of prior service cost (credit) |  | 1 |  |  | 1 |  |  | — |  |  | (3 | ) |  | (3 | ) |  | (3 | )
Amortization of net actuarial loss (gain) |  | 52 |  |  | 35 |  |  | 5 |  |  | (6 | ) |  | — |  |  | 1 |
Curtailment and settlement loss |  | 5 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net benefit (credit) cost(a) |  | 39 |  |  | 10 |  |  | (35 | ) |  | (14 | ) |  | (5 | ) |  | (4 | )
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss: |  |  |  |  |  |  |  |  |  |  |  |
Net loss (gain) arising during period |  | 17 |  |  | 116 |  |  | 267 |  |  | (25 | ) |  | (48 | ) |  | (49 | )
Prior service cost (credit) arising during period |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization or settlement recognition of net actuarial (loss) gain |  | (64 | ) |  | (34 | ) |  | (5 | ) |  | 6 |  |  | — |  |  | (1 | )
Amortization of prior service credit |  | (1 | ) |  | — |  |  | — |  |  | 1 |  |  | 1 |  |  | 1 |
Exchange rate changes |  | — |  |  | 1 |  |  | — |  |  | — |  |  | — |  |  | — |
Total recognized in total other comprehensive (income) loss |  | (48 | ) |  | 83 |  |  | 262 |  |  | (18 | ) |  | (47 | ) |  | (49 | )
Total recognized in net benefit cost (credit) and other comprehensive (income) loss |  | $ | (9 | ) |  | $ | 93 |  |  | $ | 227 |  |  | $ | (32 | ) |  | $ | (52 | ) |  | $ | (53 | )
_______
(a) | 2017 and 2016 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 Tabular disclosure of the amounts related to pension plans and/or other employee benefit plans in accumulated other comprehensive income or loss that have not yet been recognized as components of net periodic benefit cost, such as the net gain (loss), net prior service cost or credit, and net transition asset or obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding restricted stock units that are fully vested and expected to vest. Includes, but is not limited to, unvested restricted stock units for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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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