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Shareholders' Equity - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  | $ (9,550) |
Other comprehensive income (loss) before reclassifications | [1] | $ (72) |  | $ (158) |  | (93) | $ (284)
Amounts reclassified from AOCI | [1] | (19) |  | 127 |  | (65) | 425
Net current period Other comprehensive (loss)/income | [1] | (91) |  | (31) |  | (158) | 141
Ending balance |  | (9,708) |  |  |  | (9,708) |
Amortization of actuarial losses |  | (2) |  | 155 |  | (6) | 469
Amortization of actuarial loss included in net periodic pension cost, tax |  | 0 |  | (45) |  | 1 | (129)
Loss on discontinuation of cash flow hedge due to forecasted transaction probable of not occurring, net |  |  |  |  |  |  | 39
Loss on discontinuation of cash flow hedge due to forecasted transaction Probable of not occurring, tax |  |  |  |  |  |  | 11
Accumulated Other Comprehensive Loss |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |
Beginning balance | [1] | (9,617) |  | (11,487) |  | (9,550) | (11,659)
Ending balance | [1] | (9,708) |  | (11,518) |  | (9,708) | (11,518)
Currency Translation Adjustments |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |
Beginning balance |  | (157) |  | (157) |  | (167) | (105)
Other comprehensive income (loss) before reclassifications |  | (39) |  | (71) |  | (29) | (123)
Amounts reclassified from AOCI |  |  |  |  |  |  |
Net current period Other comprehensive (loss)/income |  | (39) |  | (71) |  | (29) | (123)
Ending balance |  | (196) |  | (228) |  | (196) | (228)
Unrealized Gains and Losses on Certain Investments |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |
Beginning balance |  |  |  | 1 |  |  | 1
Other comprehensive income (loss) before reclassifications |  | 1 |  | (2) |  | 1 | (2)
Amounts reclassified from AOCI |  |  |  |  |  |  |
Net current period Other comprehensive (loss)/income |  | 1 |  | (2) |  | 1 | (2)
Ending balance |  | 1 |  | (1) |  | 1 | (1)
Unrealized Gains and Losses on Derivative Instruments |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |
Beginning balance |  | (51) |  | (38) |  | (24) | 6
Other comprehensive income (loss) before reclassifications |  | (35) |  | (83) |  | (60) | (157)
Amounts reclassified from AOCI |  | 4 |  | (6) |  | 2 | 24
Net current period Other comprehensive (loss)/income |  | (31) |  | (89) |  | (58) | (133)
Ending balance |  | (82) |  | (127) |  | (82) | (127)
Defined Benefit Pension Plans & Other Postretirement Benefits |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |
Beginning balance |  | (9,409) |  | (11,293) |  | (9,359) | (11,561)
Other comprehensive income (loss) before reclassifications |  | 1 |  | (2) |  | (5) | (2)
Amounts reclassified from AOCI |  | (23) | [2] | 133 | [2] | (67) | 401
Net current period Other comprehensive (loss)/income |  | (22) |  | 131 |  | (72) | 399
Ending balance |  | $ (9,431) |  | $ (11,162) |  | $ (9,431) | $ (11,162)
[1] | Net of tax.
[2] | Primarily relates to amortization of actuarial losses for the nine and three months ended September 30, 2022 totaling $469 and $155 (net of tax of ($129) and ($45)), which are included in the net periodic pension cost.

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- Definition Amount, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source. + 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 -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(2)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480016/944-40-65-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (h)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480016/944-40-65-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(a)(3)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14 + Details
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