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COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS (Tables) | 12 Months Ended
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Dec. 31, 2015
Net Periodic Benefit Cost for Pension and Postretirement Benefit Plans | Information about net periodic benefit cost for the company-sponsored pension and postretirement benefit plans is as follows (in millions):
| U.S. Pension Benefits |  | U.S. Postretirement Medical Benefits |  | International Pension Benefits
| 2015 |  | 2014 |  | 2013 |  | 2015 |  | 2014 |  | 2013 |  | 2015 |  | 2014 |  | 2013
Net Periodic Benefit Cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 1,527 |  |  | $ | 1,137 |  |  | $ | 1,349 |  |  | $ | 34 |  |  | $ | 62 |  |  | $ | 103 |  |  | $ | 48 |  |  | $ | 43 |  |  | $ | 47 |
Interest cost | 1,694 |  |  | 1,604 |  |  | 1,449 |  |  | 117 |  |  | 152 |  |  | 185 |  |  | 44 |  |  | 49 |  |  | 44 |
Expected return on assets | (2,489 | ) |  | (2,257 | ) |  | (2,147 | ) |  | (17 | ) |  | (25 | ) |  | (33 | ) |  | (61 | ) |  | (61 | ) |  | (55 | )
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transition obligation | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Prior service cost | 168 |  |  | 169 |  |  | 172 |  |  | 5 |  |  | — |  |  | 4 |  |  | 1 |  |  | 1 |  |  | 2 |
Actuarial (gain) loss | 70 |  |  | 991 |  |  | — |  |  | 17 |  |  | 767 |  |  | — |  |  | 31 |  |  | 48 |  |  | — |
Curtailment and settlement loss | — |  |  | — |  |  | — |  |  | — |  |  | 356 |  |  | — |  |  | — |  |  | — |  |  | — |
Other | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 4 |  |  | (5 | )
Net periodic benefit cost | $ | 970 |  |  | $ | 1,644 |  |  | $ | 823 |  |  | $ | 156 |  |  | $ | 1,312 |  |  | $ | 259 |  |  | $ | 63 |  |  | $ | 84 |  |  | $ | 33 |
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 2015 results (in millions):
| 1% Increase |  | 1% Decrease
Effect on total of service cost and interest cost | $ | 4 |  |  | $ | (4 | )
Effect on postretirement benefit obligation | $ | 73 |  |  | $ | (79 | )
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
| 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014
Benefit Obligations: |  |  |  |  |  |  |  |  |  |  |
Projected benefit obligation at beginning of year | $ | 37,521 |  |  | $ | 29,508 |  |  | $ | 2,883 |  |  | $ | 4,046 |  |  | $ | 1,274 |  |  | $ | 1,076 |
Service cost | 1,527 |  |  | 1,137 |  |  | 34 |  |  | 62 |  |  | 48 |  |  | 43 |
Interest cost | 1,694 |  |  | 1,604 |  |  | 117 |  |  | 152 |  |  | 44 |  |  | 49 |
Gross benefits paid | (1,056 | ) |  | (924 | ) |  | (262 | ) |  | (255 | ) |  | (30 | ) |  | (26 | )
Plan participants’ contributions | — |  |  | — |  |  | 21 |  |  | 15 |  |  | 6 |  |  | 5 |
Plan amendments | — |  |  | 5 |  |  | — |  |  | 65 |  |  | (2 | ) |  | — |
Actuarial (gain)/loss | (2,840 | ) |  | 6,191 |  |  | (120 | ) |  | 1,069 |  |  | 13 |  |  | 194 |
Foreign currency exchange rate changes | — |  |  | — |  |  | — |  |  | — |  |  | (138 | ) |  | (103 | )
Curtailments and settlements | — |  |  | — |  |  | — |  |  | (2,271 | ) |  | (3 | ) |  | (2 | )
Other | — |  |  | — |  |  | — |  |  | — |  |  | 7 |  |  | 38 |
Projected benefit obligation at end of year | $ | 36,846 |  |  | $ | 37,521 |  |  | $ | 2,673 |  |  | $ | 2,883 |  |  | $ | 1,219 |  |  | $ | 1,274 |
| U.S. Pension Benefits |  | U.S. Postretirement Medical Benefits |  | International Pension Benefits
| 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014
Fair Value of Plan Assets: |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | $ | 28,828 |  |  | $ | 26,224 |  |  | $ | 259 |  |  | $ | 355 |  |  | $ | 1,042 |  |  | $ | 931 |
Actual return on plan assets | 67 |  |  | 2,471 |  |  | — |  |  | 22 |  |  | 43 |  |  | 106 |
Employer contributions | 1,048 |  |  | 1,057 |  |  | 111 |  |  | 122 |  |  | 70 |  |  | 79 |
Plan participants’ contributions | — |  |  | — |  |  | 21 |  |  | 15 |  |  | 3 |  |  | 3 |
Gross benefits paid | (1,056 | ) |  | (924 | ) |  | (261 | ) |  | (255 | ) |  | (30 | ) |  | (26 | )
Foreign currency exchange rate changes | — |  |  | — |  |  | — |  |  | — |  |  | (113 | ) |  | (79 | )
Curtailments and settlements | — |  |  | — |  |  | — |  |  | — |  |  | (3 | ) |  | (2 | )
Other | — |  |  | — |  |  | — |  |  | — |  |  | 2 |  |  | 30 |
Fair value of plan assets at end of year | $ | 28,887 |  |  | $ | 28,828 |  |  | $ | 130 |  |  | $ | 259 |  |  | $ | 1,014 |  |  | $ | 1,042 |
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 (in millions):
| U.S. Pension Benefits |  | U.S. Postretirement Medical Benefits |  | International Pension Benefits
| 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014
Funded Status: |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets | $ | 28,887 |  |  | $ | 28,828 |  |  | $ | 130 |  |  | $ | 259 |  |  | $ | 1,014 |  |  | $ | 1,042 |
Benefit obligation | (36,846 | ) |  | (37,521 | ) |  | (2,673 | ) |  | (2,883 | ) |  | (1,219 | ) |  | (1,274 | )
Funded status recognized at December 31 | $ | (7,959 | ) |  | $ | (8,693 | ) |  | $ | (2,543 | ) |  | $ | (2,624 | ) |  | $ | (205 | ) |  | $ | (232 | )
Funded Status Recognized in our Balance Sheet: |  |  |  |  |  |  |  |  |  |  |
Other non-current assets | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 48 |  |  | $ | 25 |
Other current liabilities | (16 | ) |  | (17 | ) |  | (98 | ) |  | (102 | ) |  | (3 | ) |  | (3 | )
Pension and postretirement benefit obligations | (7,943 | ) |  | (8,676 | ) |  | (2,445 | ) |  | (2,522 | ) |  | (250 | ) |  | (254 | )
Net liability at December 31 | $ | (7,959 | ) |  | $ | (8,693 | ) |  | $ | (2,543 | ) |  | $ | (2,624 | ) |  | $ | (205 | ) |  | $ | (232 | )
Amounts Recognized in AOCI: |  |  |  |  |  |  |  |  |  |  |
Unrecognized net prior service cost | $ | (954 | ) |  | $ | (1,122 | ) |  | $ | (26 | ) |  | $ | (32 | ) |  | $ | (4 | ) |  | $ | (7 | )
Unrecognized net actuarial gain (loss) | (3,263 | ) |  | (3,752 | ) |  | 32 |  |  | (89 | ) |  | (103 | ) |  | (103 | )
Gross unrecognized cost at December 31 | (4,217 | ) |  | (4,874 | ) |  | 6 |  |  | (121 | ) |  | (107 | ) |  | (110 | )
Deferred tax assets (liabilities) at December 31 | 1,585 |  |  | 1,833 |  |  | (2 | ) |  | 45 |  |  | 26 |  |  | 29 |
Net unrecognized cost at December 31 | $ | (2,632 | ) |  | $ | (3,041 | ) |  | $ | 4 |  |  | $ | (76 | ) |  | $ | (81 | ) |  | $ | (81 | )
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, 2015 and 2014, 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
2015 |  | 2014 |  | 2015 |  | 2014
U.S. Pension Benefits: |  |  |  |  |  |  |
Projected benefit obligation | $ | 36,846 |  |  | $ | 37,521 |  |  | $ | 36,846 |  |  | $ | 37,521 |
Accumulated benefit obligation | 34,210 |  |  | 34,725 |  |  | 34,210 |  |  | 34,725 |
Fair value of plan assets | 28,887 |  |  | 28,828 |  |  | 28,887 |  |  | 28,828 |
International Pension Benefits: |  |  |  |  |  |  |
Projected benefit obligation | $ | 493 |  |  | $ | 510 |  |  | $ | 477 |  |  | $ | 474 |
Accumulated benefit obligation | 416 |  |  | 426 |  |  | 401 |  |  | 398 |
Fair value of plan assets | 247 |  |  | 261 |  |  | 232 |  |  | 232 |
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, 2015 are presented below (in millions), as well as the percentage that each category comprises of our total plan assets and the respective target allocations.
| Level 1 |  | Level 2 |  | Level 3 |  | Total Assets |  | Percentage of Plan Assets - 2015 |  | Target Allocation 2015
Asset Category (U.S. Plans): |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 716 |  |  | $ | 95 |  |  | $ | — |  |  | $ | 811 |  |  | 2.8 | % |  | 0-5
Equity Securities: |  |  |  |  |  |  |  |  |  |  |
U.S. Large Cap | 2,542 |  |  | 1,704 |  |  | — |  |  | 4,246 |  |  |  |  |
U.S. Small Cap | 310 |  |  | 42 |  |  | — |  |  | 352 |  |  |  |  |
Emerging Markets | 1,271 |  |  | 155 |  |  | — |  |  | 1,426 |  |  |  |  |
Global Equity | 2,935 |  |  | — |  |  | — |  |  | 2,935 |  |  |  |  |
International Equity | 2,308 |  |  | 781 |  |  | — |  |  | 3,089 |  |  |  |  |
Total Equity Securities | 9,366 |  |  | 2,682 |  |  | — |  |  | 12,048 |  |  | 41.5 |  |  | 35-55
Fixed Income Securities: |  |  |  |  |  |  |  |  |  |  |
U.S. Government Securities | 3,257 |  |  | 212 |  |  | — |  |  | 3,469 |  |  |  |  |
Corporate Bonds | — |  |  | 3,682 |  |  | 279 |  |  | 3,961 |  |  |  |  |
Global Bonds | — |  |  | 147 |  |  | 586 |  |  | 733 |  |  |  |  |
Municipal Bonds | — |  |  | 36 |  |  | — |  |  | 36 |  |  |  |  |
Total Fixed Income Securities | 3,257 |  |  | 4,077 |  |  | 865 |  |  | 8,199 |  |  | 28.2 |  |  | 25-35
Other Investments: |  |  |  |  |  |  |  |  |  |  |
Hedge Funds | — |  |  | — |  |  | 3,617 |  |  | 3,617 |  |  | 12.5 |  |  | 5-15
Private Equity | — |  |  | — |  |  | 1,415 |  |  | 1,415 |  |  | 4.9 |  |  | 1-10
Real Estate | 126 |  |  | 155 |  |  | 1,567 |  |  | 1,848 |  |  | 6.4 |  |  | 1-10
Structured Products(1) | — |  |  | 324 |  |  | — |  |  | 324 |  |  | 1.1 |  |  | 0-5
Risk Parity Funds | — |  |  | — |  |  | 755 |  |  | 755 |  |  | 2.6 |  |  | 1-10
Total U.S. Plan Assets | $ | 13,465 |  |  | $ | 7,333 |  |  | $ | 8,219 |  |  | $ | 29,017 |  |  | 100.0 | % |  |
Asset Category (International Plans): |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 9 |  |  | $ | 16 |  |  | $ | — |  |  | 25 |  |  | 2.5 |  |  | 0-5
Equity Securities: |  |  |  |  |  |  |  |  |  |  |
Local Markets Equity | 133 |  |  | 107 |  |  | — |  |  | 240 |  |  |  |  |
U.S. Equity | 16 |  |  | — |  |  | — |  |  | 16 |  |  |  |  |
Emerging Markets | 16 |  |  | — |  |  | — |  |  | 16 |  |  |  |  |
International / Global Equity | 84 |  |  | 92 |  |  | — |  |  | 176 |  |  |  |  |
Total Equity Securities | 249 |  |  | 199 |  |  | — |  |  | 448 |  |  | 44.1 |  |  | 50-65
Fixed Income Securities: |  |  |  |  |  |  |  |  |  |  |
Local Government Bonds | 72 |  |  | — |  |  | — |  |  | 72 |  |  |  |  |
Corporate Bonds | 56 |  |  | 93 |  |  | — |  |  | 149 |  |  |  |  |
Total Fixed Income Securities | 128 |  |  | 93 |  |  | — |  |  | 221 |  |  | 21.8 |  |  | 15-35
Other Investments: |  |  |  |  |  |  |  |  |  |  |
Real Estate | — |  |  | 111 |  |  | — |  |  | 111 |  |  | 10.9 |  |  | 0-17
Other | — |  |  | 160 |  |  | 49 |  |  | 209 |  |  | 20.7 |  |  | 0-20
Total International Plan Assets | $ | 386 |  |  | $ | 579 |  |  | $ | 49 |  |  | $ | 1,014 |  |  | 100.0 | % |  |
Total Plan Assets | $ | 13,851 |  |  | $ | 7,912 |  |  | $ | 8,268 |  |  | $ | 30,031 |  |  |  |  |
(1) 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, 2014 are presented below (in millions), as well as the percentage that each category comprises of our total plan assets and the respective target allocations.
| Level 1 |  | Level 2 |  | Level 3 |  | Total Assets |  | Percentage of Plan Assets - 2014 |  | Target Allocation 2014
Asset Category (U.S. Plans): |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 744 |  |  | $ | 1,028 |  |  | $ | — |  |  | $ | 1,772 |  |  | 6.1 | % |  | 0-5
Equity Securities: |  |  |  |  |  |  |  |  |  |  |
U.S. Large Cap | 2,066 |  |  | 2,082 |  |  | — |  |  | 4,148 |  |  |  |  |
U.S. Small Cap | 322 |  |  | 44 |  |  | — |  |  | 366 |  |  |  |  |
Emerging Markets | 1,270 |  |  | 116 |  |  | — |  |  | 1,386 |  |  |  |  |
Global Equity | 2,788 |  |  | — |  |  | — |  |  | 2,788 |  |  |  |  |
International Equity | 1,154 |  |  | 792 |  |  | — |  |  | 1,946 |  |  |  |  |
Total Equity Securities | 7,600 |  |  | 3,034 |  |  | — |  |  | 10,634 |  |  | 36.6 |  |  | 35-55
Fixed Income Securities: |  |  |  |  |  |  |  |  |  |  |
U.S. Government Securities | 4,541 |  |  | 239 |  |  | — |  |  | 4,780 |  |  |  |  |
Corporate Bonds | 6 |  |  | 2,921 |  |  | 269 |  |  | 3,196 |  |  |  |  |
Global Bonds | — |  |  | 159 |  |  | 613 |  |  | 772 |  |  |  |  |
Municipal Bonds | — |  |  | 100 |  |  | — |  |  | 100 |  |  |  |  |
Total Fixed Income Securities | 4,547 |  |  | 3,419 |  |  | 882 |  |  | 8,848 |  |  | 30.4 |  |  | 25-35
Other Investments: |  |  |  |  |  |  |  |  |  |  |
Hedge Funds | — |  |  | — |  |  | 3,595 |  |  | 3,595 |  |  | 12.4 |  |  | 5-15
Private Equity | — |  |  | — |  |  | 1,323 |  |  | 1,323 |  |  | 4.5 |  |  | 1-10
Real Estate | 412 |  |  | 47 |  |  | 1,307 |  |  | 1,766 |  |  | 6.1 |  |  | 1-10
Structured Products(1) | — |  |  | 332 |  |  | — |  |  | 332 |  |  | 1.1 |  |  | 0-5
Risk Parity Funds | — |  |  | — |  |  | 817 |  |  | 817 |  |  | 2.8 |  |  | 1-10
Total U.S. Plan Assets | $ | 13,303 |  |  | $ | 7,860 |  |  | $ | 7,924 |  |  | $ | 29,087 |  |  | 100.0 | % |  |
Asset Category (International Plans): |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 6 |  |  | $ | 26 |  |  | $ | — |  |  | 32 |  |  | 3.1 |  |  | 0-5
Equity Securities: |  |  |  |  |  |  |  |  |  |  |
Local Markets Equity | 145 |  |  | 105 |  |  | — |  |  | 250 |  |  |  |  |
U.S. Equity | 17 |  |  | — |  |  | — |  |  | 17 |  |  |  |  |
Emerging Markets | 19 |  |  | — |  |  | — |  |  | 19 |  |  |  |  |
International / Global Equity | 82 |  |  | 95 |  |  | — |  |  | 177 |  |  |  |  |
Total Equity Securities | 263 |  |  | 200 |  |  | — |  |  | 463 |  |  | 44.3 |  |  | 50-65
Fixed Income Securities: |  |  |  |  |  |  |  |  |  |  |
Local Government Bonds | 78 |  |  | — |  |  | — |  |  | 78 |  |  |  |  |
Corporate Bonds | 55 |  |  | 94 |  |  | — |  |  | 149 |  |  |  |  |
Total Fixed Income Securities | 133 |  |  | 94 |  |  | — |  |  | 227 |  |  | 21.8 |  |  | 15-35
Other Investments: |  |  |  |  |  |  |  |  |  |  |
Real Estate | — |  |  | 108 |  |  | — |  |  | 108 |  |  | 10.4 |  |  | 0-17
Other | — |  |  | 159 |  |  | 53 |  |  | 212 |  |  | 20.4 |  |  | 0-20
Total International Plan Assets | $ | 402 |  |  | $ | 587 |  |  | $ | 53 |  |  | $ | 1,042 |  |  | 100.0 | % |  |
Total Plan Assets | $ | 13,705 |  |  | $ | 8,447 |  |  | $ | 7,977 |  |  | $ | 30,129 |  |  |  |  |
(1) 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, 2015 and 2014 (in millions).
| Corporate Bonds |  | Hedge Funds |  | Real Estate |  | Private Equity |  | Global Bonds |  | Risk Parity Funds |  | Other |  | Total
Balance on January 1, 2014 | $ | 223 |  |  | $ | 3,738 |  |  | $ | 1,091 |  |  | $ | 1,397 |  |  | $ | — |  |  | $ | 756 |  |  | $ | 55 |  |  | $ | 7,260 |
Actual Return on Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Held at End of Year | — |  |  | 71 |  |  | 104 |  |  | 11 |  |  | — |  |  | 61 |  |  | (2 | ) |  | 245 |
Assets Sold During the Year | — |  |  | (9 | ) |  | 23 |  |  | 126 |  |  | — |  |  | — |  |  | — |  |  | 140 |
Purchases | 108 |  |  | 1,043 |  |  | 350 |  |  | 166 |  |  | 735 |  |  | — |  |  | — |  |  | 2,402 |
Sales | (62 | ) |  | (1,248 | ) |  | (261 | ) |  | (377 | ) |  | (122 | ) |  | — |  |  | — |  |  | (2,070 | )
Transfers Into (Out of) Level 3 | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Balance on December 31, 2014 | $ | 269 |  |  | $ | 3,595 |  |  | $ | 1,307 |  |  | $ | 1,323 |  |  | $ | 613 |  |  | $ | 817 |  |  | $ | 53 |  |  | $ | 7,977 |
Actual Return on Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Held at End of Year | (8 | ) |  | 62 |  |  | 79 |  |  | (39 | ) |  | 11 |  |  | (62 | ) |  | (4 | ) |  | 39 |
Assets Sold During the Year | — |  |  | 39 |  |  | 45 |  |  | 149 |  |  | (2 | ) |  | — |  |  | — |  |  | 231 |
Purchases | 22 |  |  | 283 |  |  | 545 |  |  | 347 |  |  | 130 |  |  | — |  |  | — |  |  | 1,327 |
Sales | (4 | ) |  | (362 | ) |  | (409 | ) |  | (365 | ) |  | (166 | ) |  | — |  |  | — |  |  | (1,306 | )
Transfers Into (Out of) Level 3 | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Balance on December 31, 2015 | $ | 279 |  |  | $ | 3,617 |  |  | $ | 1,567 |  |  | $ | 1,415 |  |  | $ | 586 |  |  | $ | 755 |  |  | $ | 49 |  |  | $ | 8,268 |
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 2016 are as follows (in millions):
| U.S. Pension Benefits |  | U.S. Postretirement Medical Benefits |  | International Pension Benefits
Prior service cost / (benefit) | $ | 166 |  |  | $ | 5 |  |  | $ | 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: |  |  |  |  |
2016 to plan trusts | $ | 1,161 |  |  | $ | — |  |  | $ | 55 |
2016 to plan participants | 16 |  |  | 101 |  |  | 3 |
Expected Benefit Payments: |  |  |  |  |
2016 | $ | 1,067 |  |  | $ | 237 |  |  | $ | 23 |
2017 | 1,168 |  |  | 236 |  |  | 23 |
2018 | 1,278 |  |  | 232 |  |  | 26 |
2019 | 1,398 |  |  | 232 |  |  | 29 |
2020 | 1,529 |  |  | 228 |  |  | 32 |
2021 - 2025 | 9,822 |  |  | 1,005 |  |  | 222 |
schedule of one basis point change in discount rate on the projected benefit obligation [Table Text Block] | As of December 31, 2015, the impact of each basis point change in the discount rate on the projected benefit obligation of the pension and postretirement medical benefit plans are as follows (in millions):
| Increase (Decrease) in the Projected Benefit Obligation
| Pension Benefits |  | Postretirement Medical Benefits
One basis point increase in discount rate | $ | (60 | ) |  | $ | (2 | )
One basis point decrease in discount rate | $ | 66 |  |  | $ | 3 |
Net Periodic Benefit Cost |
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
| 2015 |  | 2014 |  | 2013 |  | 2015 |  | 2014 |  | 2013 |  | 2015 |  | 2014 |  | 2013
Discount rate | 4.40 | % |  | 5.32 | % |  | 4.42 | % |  | 4.18 | % |  | 4.89 | % |  | 4.21 | % |  | 3.56 | % |  | 4.35 | % |  | 4.00 | %
Rate of compensation increase | 4.29 | % |  | 4.29 | % |  | 4.16 | % |  | N/A |  |  | N/A |  |  | N/A |  |  | 3.08 | % |  | 3.22 | % |  | 3.03 | %
Expected return on assets | 8.75 | % |  | 8.75 | % |  | 8.75 | % |  | 8.75 | % |  | 8.75 | % |  | 8.75 | % |  | 6.03 | % |  | 6.29 | % |  | 6.90 | %

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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=58740216&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=58740216&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=58740216&loc=d3e1928-114920 + 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=58740216&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=58740216&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=58740216&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=58242635&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=58740216&loc=d3e1928-114920 + Details
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