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Employee Benefit Plans (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
PRB plans | $ 4 | $ 8 | $ 13 | $ 12 |
Defined contribution plans | 339 | 317 | 734 | 689 |
Liability, Defined Benefit Plan, Current | 270 |  | 270 |  | $ 270
Liability, Defined Benefit Pension Plan, Noncurrent | 2,264 |  | 2,264 |  | 2,385
Non-service pension income | (374) | (447) | (760) | (891) |
Marketable securities held in trusts | 714 |  | 714 |  | 745
UNITED STATES |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Defined benefit plans | 0 | 0 | 0 | 0 |
Foreign Plan |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Defined benefit plans | 10 | 20 | 12 | 28 |
Pension Plan [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Assets for Plan Benefits, Defined Benefit Plan | 1,906 |  | 1,906 |  | 1,296
Liability, Defined Benefit Pension Plan, Noncurrent | 1,634 |  | 1,634 |  | 1,737
Service cost | 47 | 56 | 94 | 111 |
Interest cost | 596 | 627 | 1,192 | 1,253 |
Expected return on plan assets | (936) | (938) | (1,873) | (1,875) |
Amortization of prior service credit | (42) | (40) | (85) | (79) |
Recognized actuarial net (gain) loss | 5 | (95) | 10 | (190) |
Net settlement, curtailment, and special termination benefit (gain) loss | 3 | 0 | (4) | 2 |
Non-service pension income | (374) | (446) | (760) | (889) |
Total net periodic (income) expense | (327) | (390) | (666) | (778) |
Other Postretirement Benefits Plan [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Liability, Defined Benefit Pension Plan, Noncurrent | 568 |  | 568 |  | 582
Service cost | 1 | 1 | 2 | 2 |
Interest cost | 11 | 12 | 22 | 24 |
Expected return on plan assets | (5) | (5) | (10) | (10) |
Amortization of prior service credit | 0 | 0 | 0 | 0 |
Recognized actuarial net (gain) loss | (6) | (8) | (12) | (16) |
Net settlement, curtailment, and special termination benefit (gain) loss | 0 | 0 | 0 | 0 |
Non-service pension income | 0 | (1) | 0 | (2) |
Total net periodic (income) expense | 1 | $ 0 | 2 | $ 0 |
Other pension and PRB related items |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Liability, Defined Benefit Pension Plan, Noncurrent | $ 62 |  | $ 62 |  | $ 66

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- Definition Amount of gain (loss), recognized immediately as component of net periodic benefit (cost) credit, for change in value of benefit obligation or plan assets from experience different from that assumed, change in actuarial assumption, or consequence of temporarily deviating from substantive plan. Includes, but is not limited to, amount in excess of 10 percent of greater of fair value of plan assets or benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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