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Employee Benefit Plans (Amounts Recorded in Accumulated Other Comprehensive Income not yet Recognized) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension Benefits |  |  |
Pension And Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Before Tax [Roll Forward] |  |  |
Balance, beginning of year | $ 2,464 |  |
Amortization for the period | 69 | $ 160 | $ 245
Deferrals for the period | (274) | 3,242 |
Impact of foreign currency changes and other | (64) | (221) |
Balance, end of period | 2,795 | 2,464 |
Pension Benefits | Prior Service Cost |  |  |
Pension And Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Before Tax [Roll Forward] |  |  |
Balance, beginning of year | (2) | (5) | (10)
Amortization for the period | 1 | 1 | 3
Deferrals for the period | (2) | 1 | 0
Impact of foreign currency changes and other | 1 | 1 | 2
Balance, end of period | (2) | (2) | (5)
Pension Benefits | Net Actuarial (Gain) Loss |  |  |
Pension And Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Before Tax [Roll Forward] |  |  |
Balance, beginning of year | 2,466 | 3,131 | 3,972
Amortization for the period | (69) | (160) | (245)
Deferrals for the period | 411 | (431) | (545)
Impact of foreign currency changes and other | (11) | (74) | (51)
Balance, end of period | 2,797 | 2,466 | 3,131
Other Postretirement Benefits |  |  |
Pension And Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Before Tax [Roll Forward] |  |  |
Balance, beginning of year | 168 |  |
Amortization for the period | 10 | 6 | 16
Deferrals for the period | (66) | 364 |
Impact of foreign currency changes and other | 0 | (1) |
Balance, end of period | (136) | 168 |
Other Postretirement Benefits | Prior Service Cost |  |  |
Pension And Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Before Tax [Roll Forward] |  |  |
Balance, beginning of year | (54) | (69) | 59
Amortization for the period | 7 | 8 | (6)
Deferrals for the period | (298) | 0 | (121)
Impact of foreign currency changes and other | 0 | 7 | (1)
Balance, end of period | (345) | (54) | (69)
Other Postretirement Benefits | Net Actuarial (Gain) Loss |  |  |
Pension And Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Before Tax [Roll Forward] |  |  |
Balance, beginning of year | 222 | 211 | 354
Amortization for the period | (10) | (6) | (16)
Deferrals for the period | (3) | 20 | (127)
Impact of foreign currency changes and other | 0 | (3) | 0
Balance, end of period | $ 209 | $ 222 | $ 211

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- Definition Pension And Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Before Tax [Roll Forward] + References No definition available. + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (i-k) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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