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Pension Plans and Other Post Employment Benefit Plans Change in Projected Benefit Obligations, Plan Assets and Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 01, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Funded (unfunded) status of plan |  |  |  |  | $ 5,800
Defined Benefit Plan, Accumulated Benefit Obligation |  | $ 21,600 | $ 21,000 |  |
Trust Agreement [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Benefit obligation at beginning of the period |  | 294 |  |  |
Benefit obligation at end of the period |  | 249 | 294 |  |
Pension Plan |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Benefit obligation at beginning of the period |  | 21,004 | 23,532 |  |
Service Cost |  | 26 | 41 | $ 136 |
Interest Cost |  | 559 | 769 | 755 |
Plan participants' contributions |  | 2 | 2 |  |
Actuarial (gain) loss |  | 1,659 | 2,469 |  |
Benefits Paid |  | (1,538) | (1,635) |  |
Plan amendments |  | (3) | (76) |  |
Net effects of acquisitions / divestitures / other |  | 0 | (1) |  |
Effect of foreign exchange rates |  | (27) | (60) |  |
Change in Benefit Obligation - Impact of Internal Reorganizations |  | 0 | (4,037) |  |
Benefit obligation at end of the period |  | 21,682 | 21,004 | 23,532 |
Fair value of plan assets at beginning of period |  | 16,941 | 18,951 |  |
Actual return on plan assets |  | 2,404 | 2,552 |  |
Employer contributions |  | 62 | 121 |  |
Plan participants' contributions |  | 2 | 2 |  |
Benefits paid |  | (1,538) | (1,635) |  |
Net effects of acquisitions / divestitures / other |  | 0 | (6) |  |
Effect of foreign exchange rates |  | (36) | (38) |  |
Change in Plan Assets - Impact of Internal Reorganizations |  | 0 | (3,006) |  |
Fair value of plan assets at end of period |  | 17,835 | 16,941 | 18,951 |
Funded (unfunded) status of plan |  | (3,847) | (4,063) |  |
Pension Plan | U.S. Plans with Plan Assets [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Funded (unfunded) status of plan |  | (3,301) | (3,535) |  |
Pension Plan | Non-U.S. plans with plan assets [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Funded (unfunded) status of plan |  | (98) | (90) |  |
Pension Plan | All other plans [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Funded (unfunded) status of plan | [1],[2] | (448) | (438) |  |
Other Post Employment Benefits Plan |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Benefit obligation at beginning of the period |  | 2,591 | 2,514 |  |
Service Cost |  | 2 | 4 | 9 |
Interest Cost |  | 66 | 84 | 85 |
Plan participants' contributions |  | 34 | 37 |  |
Actuarial (gain) loss |  | 59 | 211 |  |
Benefits Paid |  | (241) | (239) |  |
Plan amendments |  | (939) | 0 |  |
Net effects of acquisitions / divestitures / other |  | 0 | 0 |  |
Effect of foreign exchange rates |  | (1) | 0 |  |
Change in Benefit Obligation - Impact of Internal Reorganizations |  | 0 | (20) |  |
Benefit obligation at end of the period |  | 1,571 | 2,591 | 2,514 |
Fair value of plan assets at beginning of period |  | 0 | 0 |  |
Actual return on plan assets |  | 0 | 0 |  |
Employer contributions |  | 207 | 202 |  |
Plan participants' contributions |  | 34 | 37 |  |
Benefits paid |  | (241) | (239) |  |
Net effects of acquisitions / divestitures / other |  | 0 | 0 |  |
Effect of foreign exchange rates |  | 0 | 0 |  |
Change in Plan Assets - Impact of Internal Reorganizations |  | 0 | 0 |  |
Fair value of plan assets at end of period |  | 0 | 0 | $ 0 |
Funded (unfunded) status of plan |  | (1,571) | (2,591) |  |
Other Post Employment Benefits Plan | U.S. Plans with Plan Assets [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Funded (unfunded) status of plan |  | 0 | 0 |  |
Other Post Employment Benefits Plan | Non-U.S. plans with plan assets [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Funded (unfunded) status of plan |  | 0 | 0 |  |
Other Post Employment Benefits Plan | All other plans [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Funded (unfunded) status of plan | [1],[2] | $ (1,571) | $ (2,591) |  |
[1] | As of December 31, 2020, and December 31, 2019, $249 million and $294 million, respectively, of the benefit obligations are supported by funding under the Trust agreement, defined in the "Trust Assets" section below.
[2] | Includes pension plans maintained around the world where funding is not customary.

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- Definition The amount of change in the benefit obligation attributed to the sale, liquidation, spin-off or other divestiture of a corporate division or subsidiary. + References No definition available. + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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