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COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS (Tables) | 12 Months Ended
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Dec. 31, 2017
Retirement Benefits [Abstract] |
Net Periodic Benefit Cost for Pension and Postretirement Benefit Plans | Information about net periodic benefit cost for the company-sponsored pension and postretirement defined benefit plans is as follows (in millions):
| U.S. Pension Benefits |  | U.S. Postretirement Medical Benefits |  | International Pension Benefits
| 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
Net Periodic Benefit Cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 1,543 |  |  | $ | 1,412 |  |  | $ | 1,527 |  |  | $ | 29 |  |  | $ | 28 |  |  | $ | 34 |  |  | $ | 60 |  |  | $ | 49 |  |  | $ | 48 |
Interest cost | 1,813 |  |  | 1,828 |  |  | 1,694 |  |  | 112 |  |  | 124 |  |  | 117 |  |  | 40 |  |  | 41 |  |  | 44 |
Expected return on assets | (2,883 | ) |  | (2,516 | ) |  | (2,489 | ) |  | (7 | ) |  | (6 | ) |  | (17 | ) |  | (66 | ) |  | (58 | ) |  | (61 | )
Amortization of prior service cost | 192 |  |  | 166 |  |  | 168 |  |  | 7 |  |  | 5 |  |  | 5 |  |  | 1 |  |  | 1 |  |  | 1 |
Actuarial (gain) loss | 729 |  |  | 2,520 |  |  | 70 |  |  | 53 |  |  | 17 |  |  | 17 |  |  | 18 |  |  | 114 |  |  | 31 |
Curtailment and settlement loss | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 2 |  |  | — |  |  | — |
Net periodic benefit cost | $ | 1,394 |  |  | $ | 3,410 |  |  | $ | 970 |  |  | $ | 194 |  |  | $ | 168 |  |  | $ | 156 |  |  | $ | 55 |  |  | $ | 147 |  |  | $ | 63 |
Weighted Average Actuarial Assumptions Used Disclosure | The table below provides the weighted-average actuarial assumptions used to determine the net periodic benefit cost.
| U.S. Pension Benefits |  | U.S. Postretirement Medical Benefits |  | International Pension Benefits
| 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
Discount rate | 4.41 | % |  | 4.86 | % |  | 4.40 | % |  | 4.23 | % |  | 4.79 | % |  | 4.18 | % |  | 2.75 | % |  | 3.51 | % |  | 3.56 | %
Rate of compensation increase | 4.27 | % |  | 4.29 | % |  | 4.29 | % |  | N/A |  |  | N/A |  |  | N/A |  |  | 3.17 | % |  | 3.04 | % |  | 3.08 | %
Expected return on assets | 8.75 | % |  | 8.75 | % |  | 8.75 | % |  | 8.75 | % |  | 8.75 | % |  | 8.75 | % |  | 5.65 | % |  | 5.73 | % |  | 6.03 | %
The table below provides the weighted-average actuarial assumptions used to determine the benefit obligations of our plans.
| U.S. Pension Benefits |  | U.S. Postretirement Medical Benefits |  | International Pension Benefits
| 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
Discount rate | 3.84 | % |  | 4.41 | % |  | 3.82 | % |  | 4.23 | % |  | 2.78 | % |  | 2.75 | %
Rate of compensation increase | 4.25 | % |  | 4.27 | % |  | N/A |  |  | N/A |  |  | 3.23 | % |  | 3.17 | %
Effects of One Percent Change in Assumed Health Care Cost Trend | A one percent change in assumed healthcare cost trend rates would have had the following effects on 2017 results (in millions):
| 1% Increase |  | 1% Decrease
Effect on total of service cost and interest cost | $ | 3 |  |  | $ | (3 | )
Effect on postretirement benefit obligation | $ | 65 |  |  | $ | (71 | )
Reconciliation of the Changes in the Plans' Benefit Obligations and Fair Value of Plan Assets | The following table provides a reconciliation of the changes in the plans’ benefit obligations and fair value of plan assets as of the respective measurement dates in each year (in millions).
| U.S. Pension Benefits |  | U.S. Postretirement Medical Benefits |  | International Pension Benefits
| 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
Benefit Obligations: |  |  |  |  |  |  |  |  |  |  |
Projected benefit obligation at beginning of year | $ | 41,069 |  |  | $ | 36,846 |  |  | $ | 2,730 |  |  | $ | 2,673 |  |  | $ | 1,425 |  |  | $ | 1,219 |
Service cost | 1,543 |  |  | 1,412 |  |  | 29 |  |  | 28 |  |  | 60 |  |  | 49 |
Interest cost | 1,813 |  |  | 1,828 |  |  | 112 |  |  | 124 |  |  | 40 |  |  | 41 |
Gross benefits paid | (1,309 | ) |  | (1,885 | ) |  | (264 | ) |  | (264 | ) |  | (32 | ) |  | (28 | )
Plan participants’ contributions | — |  |  | — |  |  | 26 |  |  | 27 |  |  | 3 |  |  | 3 |
Plan amendments(1) | — |  |  | 285 |  |  | — |  |  | 15 |  |  | — |  |  | — |
Actuarial (gain)/loss | 4,256 |  |  | 2,583 |  |  | 159 |  |  | 126 |  |  | 26 |  |  | 208 |
Foreign currency exchange rate changes | — |  |  | — |  |  | — |  |  | — |  |  | 129 |  |  | (67 | )
Curtailments and settlements | (1,525 | ) |  | — |  |  | — |  |  | — |  |  | (3 | ) |  | (3 | )
Other | — |  |  | — |  |  | — |  |  | 1 |  |  | 3 |  |  | 3 |
Projected benefit obligation at end of year | $ | 45,847 |  |  | $ | 41,069 |  |  | $ | 2,792 |  |  | $ | 2,730 |  |  | $ | 1,651 |  |  | $ | 1,425 |
(1) Resulting from a new labor contract with the Independent Pilots Association.
| U.S. Pension Benefits |  | U.S. Postretirement Medical Benefits |  | International Pension Benefits
| 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
Fair Value of Plan Assets: |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | $ | 31,215 |  |  | $ | 28,887 |  |  | $ | 15 |  |  | $ | 130 |  |  | $ | 1,092 |  |  | $ | 1,014 |
Actual return on plan assets | 4,717 |  |  | 1,735 |  |  | (2 | ) |  | 3 |  |  | 96 |  |  | 108 |
Employer contributions | 7,309 |  |  | 2,478 |  |  | 408 |  |  | 119 |  |  | 77 |  |  | 71 |
Plan participants’ contributions | — |  |  | — |  |  | 26 |  |  | 27 |  |  | 3 |  |  | 3 |
Gross benefits paid | (1,309 | ) |  | (1,885 | ) |  | (264 | ) |  | (264 | ) |  | (32 | ) |  | (28 | )
Foreign currency exchange rate changes | — |  |  | — |  |  | — |  |  | — |  |  | 100 |  |  | (73 | )
Curtailments and settlements | — |  |  | — |  |  | — |  |  | — |  |  | (3 | ) |  | (3 | )
Fair value of plan assets at end of year | $ | 41,932 |  |  | $ | 31,215 |  |  | $ | 183 |  |  | $ | 15 |  |  | $ | 1,333 |  |  | $ | 1,092 |
Funded Status as of the Respective Measurement Dates in Each Year and the Amounts Recognized in Balance Sheet | The following table discloses the funded status of our plans and the amounts recognized in our consolidated balance sheets as of December 31 st (in millions):
| U.S. Pension Benefits |  | U.S. Postretirement Medical Benefits |  | International Pension Benefits
| 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
Funded Status: |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets | $ | 41,932 |  |  | $ | 31,215 |  |  | $ | 183 |  |  | $ | 15 |  |  | $ | 1,333 |  |  | $ | 1,092 |
Benefit obligation | (45,847 | ) |  | (41,069 | ) |  | (2,792 | ) |  | (2,730 | ) |  | (1,651 | ) |  | (1,425 | )
Funded status recognized at December 31 | $ | (3,915 | ) |  | $ | (9,854 | ) |  | $ | (2,609 | ) |  | $ | (2,715 | ) |  | $ | (318 | ) |  | $ | (333 | )
Funded Status Recognized in our Balance Sheet: |  |  |  |  |  |  |  |  |  |  |
Other non-current assets | $ | 284 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 35 |  |  | $ | 28 |
Other current liabilities | (18 | ) |  | (17 | ) |  | (77 | ) |  | (216 | ) |  | (5 | ) |  | (3 | )
Pension and postretirement benefit obligations | (4,181 | ) |  | (9,837 | ) |  | (2,532 | ) |  | (2,499 | ) |  | (348 | ) |  | (358 | )
Net liability at December 31 | $ | (3,915 | ) |  | $ | (9,854 | ) |  | $ | (2,609 | ) |  | $ | (2,715 | ) |  | $ | (318 | ) |  | $ | (333 | )
Amounts Recognized in AOCI: |  |  |  |  |  |  |  |  |  |  |
Unrecognized net prior service cost | $ | (880 | ) |  | $ | (1,074 | ) |  | $ | (29 | ) |  | $ | (36 | ) |  | $ | (2 | ) |  | $ | (3 | )
Unrecognized net actuarial gain (loss) | (4,277 | ) |  | (4,107 | ) |  | (195 | ) |  | (80 | ) |  | (126 | ) |  | (150 | )
Gross unrecognized cost at December 31 | (5,157 | ) |  | (5,181 | ) |  | (224 | ) |  | (116 | ) |  | (128 | ) |  | (153 | )
Deferred tax assets (liabilities) at December 31 | 1,840 |  |  | 1,948 |  |  | 69 |  |  | 44 |  |  | 31 |  |  | 37 |
Net unrecognized cost at December 31 | $ | (3,317 | ) |  | $ | (3,233 | ) |  | $ | (155 | ) |  | $ | (72 | ) |  | $ | (97 | ) |  | $ | (116 | )
Projected Benefit Obligation, Accumulated Benefit Obligation, and Fair Value of Plan Assets for Pension Plans With an Accumulated Benefit Obligation in Excess of Plan Assets | At December 31, 2017 and 2016, the projected benefit obligation, the accumulated benefit obligation and the fair value of plan assets for pension plans with benefit obligations in excess of plan assets were as follows (in millions):
| Projected Benefit Obligation Exceeds the Fair Value of Plan Assets |  | Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets
2017 |  | 2016 |  | 2017 |  | 2016
U.S. Pension Benefits: |  |  |  |  |  |  |
Projected benefit obligation | $ | 37,113 |  |  | $ | 41,069 |  |  | $ | 37,113 |  |  | $ | 41,069 |
Accumulated benefit obligation | 35,538 |  |  | 38,194 |  |  | 35,538 |  |  | 38,194 |
Fair value of plan assets | 32,914 |  |  | 31,215 |  |  | 32,914 |  |  | 31,215 |
International Pension Benefits: |  |  |  |  |  |  |
Projected benefit obligation | $ | 1,138 |  |  | $ | 1,370 |  |  | $ | 647 |  |  | $ | 1,365 |
Accumulated benefit obligation | 992 |  |  | 1,238 |  |  | 549 |  |  | 1,234 |
Fair value of plan assets | 798 |  |  | 1,020 |  |  | 342 |  |  | 1,016 |
Fair Values of U.S. Pension and Postretirement Benefit Plan Assets by Asset Category as Well as the Percentage That Each Category Comprises of Total Plan Assets and the Respective Target Allocations | The fair values of U.S. and international pension and postretirement benefit plan assets by asset category as of December 31, 2017 are presented below (in millions), as well as the percentage that each category comprises of our total plan assets and the respective target allocations.
| Total Assets(1) |  | Level 1 |  | Level 2 |  | Level 3 |  | Percentage of Plan Assets |  | Target Allocation
Asset Category (U.S. Plans): |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents(2) | $ | 5,725 |  |  | $ | 5,292 |  |  | $ | 433 |  |  | $ | — |  |  | 13.6 | % |  | 0-5
Equity Securities: |  |  |  |  |  |  |  |  |  |  |
U.S. Large Cap | 5,924 |  |  | 3,121 |  |  | 2,803 |  |  | — |  |  |  |  |
U.S. Small Cap | 591 |  |  | 421 |  |  | 170 |  |  | — |  |  |  |  |
Emerging Markets | 2,101 |  |  | 1,669 |  |  | 432 |  |  | — |  |  |  |  |
Global Equity | 2,817 |  |  | 2,400 |  |  | 417 |  |  | — |  |  |  |  |
International Equity | 4,791 |  |  | 2,950 |  |  | 1,841 |  |  | — |  |  |  |  |
Total Equity Securities | 16,224 |  |  | 10,561 |  |  | 5,663 |  |  | — |  |  | 38.5 |  |  | 35-55
Fixed Income Securities: |  |  |  |  |  |  |  |  |  |  |
U.S. Government Securities | 7,695 |  |  | 7,323 |  |  | 372 |  |  | — |  |  |  |  |
Corporate Bonds | 3,865 |  |  | — |  |  | 3,857 |  |  | 8 |  |  |  |  |
Global Bonds | 53 |  |  | — |  |  | 53 |  |  | — |  |  |  |  |
Municipal Bonds | 21 |  |  | — |  |  | 21 |  |  | — |  |  |  |  |
Total Fixed Income Securities | 11,634 |  |  | 7,323 |  |  | 4,303 |  |  | 8 |  |  | 27.6 |  |  | 25-35
Other Investments: |  |  |  |  |  |  |  |  |  |  |
Hedge Funds | 2,910 |  |  | — |  |  | 1,031 |  |  | — |  |  | 6.9 |  |  | 5-15
Private Equity | 2,107 |  |  | — |  |  | — |  |  | — |  |  | 5.0 |  |  | 1-10
Private Debt | 953 |  |  | — |  |  | 237 |  |  | — |  |  | 2.3 |  |  | 1-10
Real Estate | 2,031 |  |  | 157 |  |  | 139 |  |  | — |  |  | 4.8 |  |  | 1-10
Structured Products(3) | 172 |  |  | — |  |  | 172 |  |  | — |  |  | 0.4 |  |  | 0-5
Risk Parity Funds | 359 |  |  | — |  |  | — |  |  |  |  |  | 0.9 |  |  | 1-10
Total U.S. Plan Assets | $ | 42,115 |  |  | $ | 23,333 |  |  | $ | 11,978 |  |  | $ | 8 |  |  | 100.0 | % |  |
Asset Category (International Plans): |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 78 |  |  | $ | 43 |  |  | $ | 35 |  |  |  |  |  | 5.8 |  |  | 0-10
Equity Securities: |  |  |  |  |  |  |  |  |  |  |
Local Markets Equity | 213 |  |  | — |  |  | 213 |  |  |  |  |  |  |  |
U.S. Equity | 30 |  |  | — |  |  | 30 |  |  |  |  |  |  |  |
Emerging Markets | 38 |  |  | 38 |  |  | — |  |  |  |  |  |  |  |
International / Global Equity | 356 |  |  | 166 |  |  | 190 |  |  |  |  |  |  |  |
Total Equity Securities | 637 |  |  | 204 |  |  | 433 |  |  | — |  |  | 47.7 |  |  | 30-60
Fixed Income Securities: |  |  |  |  |  |  |  |  |  |  |
Local Government Bonds | 103 |  |  | 25 |  |  | 78 |  |  |  |  |  |  |  |
Corporate Bonds | 198 |  |  | 59 |  |  | 139 |  |  |  |  |  |  |  |
Total Fixed Income Securities | 301 |  |  | 84 |  |  | 217 |  |  | — |  |  | 22.6 |  |  | 25-50
Other Investments: |  |  |  |  |  |  |  |  |  |  |
Real Estate | 124 |  |  | — |  |  | 79 |  |  |  |  |  | 9.3 |  |  | 5-10
Other | 193 |  |  | — |  |  | 184 |  |  |  |  |  | 14.6 |  |  | 0-20
Total International Plan Assets | $ | 1,333 |  |  | $ | 331 |  |  | $ | 948 |  |  | $ | — |  |  | 100.0 | % |  |
Total Plan Assets | $ | 43,448 |  |  | $ | 23,664 |  |  | $ | 12,926 |  |  | $ | 8 |  |  |  |  |
(1) Certain investments that are measured at fair value using the NAV per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy but are included in the category totals. (2) Includes $5 billion in contributions made in December 2017 that had not yet been invested according to the targeted allocation. (3) Represents mortgage and asset-backed securities. The fair values of U.S. and international pension and postretirement benefit plan assets by asset category as of December 31, 2016 are presented below (in millions), as well as the percentage that each category comprises of our total plan assets and the respective target allocations.
| Total Assets(1) |  | Level 1 |  | Level 2 |  | Level 3 |  | Percentage of Plan Assets |  | Target Allocation
Asset Category (U.S. Plans): |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 304 |  |  | $ | 102 |  |  | $ | 202 |  |  | $ | — |  |  | 1.0 | % |  | 0-5
Equity Securities: |  |  |  |  |  |  |  |  |  |  |
U.S. Large Cap | 4,883 |  |  | 2,327 |  |  | 2,556 |  |  | — |  |  |  |  |
U.S. Small Cap | 542 |  |  | 393 |  |  | 149 |  |  | — |  |  |  |  |
Emerging Markets | 1,396 |  |  | 1,236 |  |  | 160 |  |  | — |  |  |  |  |
Global Equity | 2,603 |  |  | 2,555 |  |  | 48 |  |  | — |  |  |  |  |
International Equity | 3,026 |  |  | 2,197 |  |  | 829 |  |  | — |  |  |  |  |
Total Equity Securities | 12,450 |  |  | 8,708 |  |  | 3,742 |  |  | — |  |  | 39.9 |  |  | 35-55
Fixed Income Securities: |  |  |  |  |  |  |  |  |  |  |
U.S. Government Securities | 6,173 |  |  | 5,821 |  |  | 352 |  |  | — |  |  |  |  |
Corporate Bonds | 4,492 |  |  | — |  |  | 4,492 |  |  | — |  |  |  |  |
Global Bonds | 161 |  |  | — |  |  | 59 |  |  | — |  |  |  |  |
Municipal Bonds | 24 |  |  | — |  |  | 24 |  |  | — |  |  |  |  |
Total Fixed Income Securities | 10,850 |  |  | 5,821 |  |  | 4,927 |  |  | — |  |  | 34.6 |  |  | 25-35
Other Investments: |  |  |  |  |  |  |  |  |  |  |
Hedge Funds | 2,867 |  |  | — |  |  | 763 |  |  | — |  |  | 9.2 |  |  | 5-15
Private Equity | 1,716 |  |  | — |  |  | — |  |  | — |  |  | 5.5 |  |  | 1-10
Private Debt | 496 |  |  | — |  |  | — |  |  | — |  |  | 1.6 |  |  | 1-10
Real Estate | 1,734 |  |  | 122 |  |  | 144 |  |  | — |  |  | 5.6 |  |  | 1-10
Structured Products(2) | 492 |  |  | — |  |  | 492 |  |  | — |  |  | 1.6 |  |  | 0-5
Risk Parity Funds | 321 |  |  | — |  |  | — |  |  | — |  |  | 1.0 |  |  | 1-10
Total U.S. Plan Assets | $ | 31,230 |  |  | $ | 14,753 |  |  | $ | 10,270 |  |  | $ | — |  |  | 100.0 | % |  |
Asset Category (International Plans): |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 54 |  |  | $ | 37 |  |  | $ | 17 |  |  | — |  |  | 4.9 |  |  | 0-15
Equity Securities: |  |  |  |  |  |  |  |  |  |  |
Local Markets Equity | 188 |  |  | — |  |  | 188 |  |  | — |  |  |  |  |
U.S. Equity | 20 |  |  | — |  |  | 20 |  |  | — |  |  |  |  |
Emerging Markets | 26 |  |  | 26 |  |  | — |  |  | — |  |  |  |  |
International / Global Equity | 288 |  |  | 141 |  |  | 147 |  |  | — |  |  |  |  |
Total Equity Securities | 522 |  |  | 167 |  |  | 355 |  |  | — |  |  | 47.7 |  |  | 50-65
Fixed Income Securities: |  |  |  |  |  |  |  |  |  |  |
Local Government Bonds | 84 |  |  | 22 |  |  | 62 |  |  | — |  |  |  |  |
Corporate Bonds | 158 |  |  | 51 |  |  | 107 |  |  | — |  |  |  |  |
Total Fixed Income Securities | 242 |  |  | 73 |  |  | 169 |  |  | — |  |  | 22.2 |  |  | 15-35
Other Investments: |  |  |  |  |  |  |  |  |  |  |
Real Estate | 93 |  |  | — |  |  | 57 |  |  | — |  |  | 8.5 |  |  | 0-17
Other | 181 |  |  | — |  |  | 175 |  |  | — |  |  | 16.7 |  |  | 0-20
Total International Plan Assets | $ | 1,092 |  |  | $ | 277 |  |  | $ | 773 |  |  | $ | — |  |  | 100.0 | % |  |
Total Plan Assets | $ | 32,322 |  |  | $ | 15,030 |  |  | $ | 11,043 |  |  | $ | — |  |  |  |  |
(1) Certain investments that are measured at fair value using the NAV per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy but are included in the category totals. (2) Represents mortgage and asset-backed securities.
Fair Value Measurement of Plan Assets Using Significant Unobservable Inputs (Level 3) | The following table presents the changes in the Level 3 instruments measured on a recurring basis for the years ended December 31, 2017 and 2016 (in millions).
| Corporate Bonds |  | Other |  | Total
Balance on January 1, 2016 | $ | 6 |  |  | $ | 49 |  |  | $ | 55 |
Actual Return on Assets: |  |  |  |  |
Assets Held at End of Year | — |  |  | — |  |  | — |
Assets Sold During the Year | — |  |  | (49 | ) |  | (49 | )
Purchases | — |  |  | — |  |  | — |
Sales | (6 | ) |  | — |  |  | (6 | )
Transfers Into (Out of) Level 3 | — |  |  | — |  |  | — |
Balance on December 31, 2016 | $ | — |  |  | $ | — |  |  | $ | — |
Actual Return on Assets: |  |  |  |  |
Assets Held at End of Year | — |  |  | — |  |  | — |
Assets Sold During the Year | — |  |  | — |  |  | — |
Purchases | 9 |  |  | — |  |  | 9 |
Sales | (1 | ) |  | — |  |  | (1 | )
Transfers Into (Out of) Level 3 | — |  |  | — |  |  | — |
Balance on December 31, 2017 | $ | 8 |  |  | $ | — |  |  | $ | 8 |
Amounts in AOCI Expected to be Amortized and Recognized as a Component of Net Periodic Benefit Cost | The estimated amounts of prior service cost in AOCI expected to be amortized and recognized as a component of net periodic benefit cost in 2018 are as follows (in millions):
| U.S. Pension Benefits |  | U.S. Postretirement Medical Benefits |  | International Pension Benefits
Prior service cost | $ | 193 |  |  | $ | 7 |  |  | $ | 1 |
Expected Cash Flows for Pension and Postretirement Benefit Plans | Information about expected cash flows for the pension and postretirement benefit plans is as follows (in millions):
| U.S. Pension Benefits |  | U.S. Postretirement Medical Benefits |  | International Pension Benefits
Expected Employer Contributions: |  |  |  |  |
2018 to plan trusts | $ | — |  |  | $ | — |  |  | $ | 75 |
2018 to plan participants | 19 |  |  | 78 |  |  | 5 |
Expected Benefit Payments: |  |  |  |  |
2018 | $ | 1,294 |  |  | $ | 237 |  |  | $ | 24 |
2019 | 1,418 |  |  | 239 |  |  | 27 |
2020 | 1,551 |  |  | 237 |  |  | 30 |
2021 | 1,691 |  |  | 231 |  |  | 36 |
2022 | 1,836 |  |  | 222 |  |  | 41 |
2023 - 2027 | 11,358 |  |  | 967 |  |  | 286 |
schedule of one basis point change in discount rate on the projected benefit obligation [Table Text Block] | As of December 31, 2017, the impact of each basis point change in the discount rate on the projected benefit obligation of the pension and postretirement medical benefit plans is as follows (in millions):
| Increase (Decrease) in the Projected Benefit Obligation
| Pension Benefits |  | Postretirement Medical Benefits
One basis point increase in discount rate | $ | (75 | ) |  | $ | (2 | )
One basis point decrease in discount rate | $ | 80 |  |  | $ | 3 |

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- Definition Tabular disclosure of accumulated benefit obligations and fair values of plan assets of pension plans and/or other employee benefit plans where the accumulated benefit obligation exceeds the fair value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details
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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + 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 (d)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + 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 (k) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the aggregate benefit obligation and aggregate fair value of plan assets for pension plans and/or other employee benefit plans with benefit obligations in excess of plan assets as of the measurement date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details
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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the effect of a one-percentage-point increase and the effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs and the accumulated postretirement benefit obligation for health care benefits. + 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 (m) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the effect of fair value measurements using significant unobservable inputs (Level 3) on changes in plan assets of pension plans and/or other employee benefit plans for the period. + 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 (d)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + 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 (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of net funded status of pension plans and/or other employee benefit plans. + 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 (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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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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