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Shareholders' Equity - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance |  | $ (10,305) |
Other comprehensive income (loss) before reclassifications | [1] | (114) | $ 27
Amounts reclassified from AOCI | [1] | 7 | (27)
Net current period Other comprehensive loss | [1] | (107) | 0
Ending balance |  | (10,412) |
Other comprehensive (income) loss, defined benefit plan, reclassification adjustment from AOCI, after tax |  | 0 | (22)
Other comprehensive (income) loss, defined benefit plan, reclassification adjustment from AOCI, tax |  | 0 | (6)
Accumulated Other Comprehensive Loss |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance | [1] | (10,305) | (9,550)
Ending balance | [1] | (10,412) | (9,550)
Currency Translation Adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance |  | (134) | (167)
Other comprehensive income (loss) before reclassifications |  | (35) | 16
Amounts reclassified from AOCI |  |  |
Net current period Other comprehensive loss |  | (35) | 16
Ending balance |  | (169) | (151)
Unrealized Gains and Losses on Certain Investments |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance |  | 2 |
Other comprehensive income (loss) before reclassifications |  |  |
Amounts reclassified from AOCI |  |  |
Net current period Other comprehensive loss |  |  |
Ending balance |  | 2 |
Unrealized Gains and Losses on Derivative Instruments |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance |  | 12 | (24)
Other comprehensive income (loss) before reclassifications |  | (65) | 18
Amounts reclassified from AOCI |  | 7 | (5)
Net current period Other comprehensive loss |  | (58) | 13
Ending balance |  | (46) | (11)
Defined Benefit Pension Plans & Other Postretirement Benefits |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance |  | (10,185) | (9,359)
Other comprehensive income (loss) before reclassifications |  | (14) | (7)
Amounts reclassified from AOCI |  |  | (22)
Net current period Other comprehensive loss |  | (14) | (29)
Ending balance |  | $ (10,199) | $ (9,388)
[1] | Net of tax. (2) Primarily relates to the amortization of prior service credits and actuarial losses/(gains) included in net periodic pension cost for the three months ended March 31, 2024 and 2023 totaling $0 and ($22) (net of tax of $0 and $6).

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