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Shareholders' Equity - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Beginning balance |  |  |  | $ (10,305) |
Other comprehensive (loss)/income before reclassifications | [1] | $ 1 | $ (48) | (113) | $ (21)
Amounts reclassified from AOCI | [1] | 19 | (19) | 26 | (46)
Net current period Other comprehensive loss | [1] | 20 | (67) | (87) | (67)
Ending balance |  | (10,392) |  | (10,392) |
Other comprehensive (income) loss, defined benefit plan, reclassification adjustment from AOCI, after tax |  | 0 | (22) | 0 | (44)
Other comprehensive (income) loss, defined benefit plan, reclassification adjustment from AOCI, tax |  | 0 | (7) | 0 | (13)
Accumulated Other Comprehensive Loss |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Beginning balance | [1] | (10,412) | (9,550) | (10,305) | (9,550)
Ending balance | [1] | (10,392) | (9,617) | (10,392) | (9,617)
Currency Translation Adjustments |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Beginning balance |  | (169) | (151) | (134) | (167)
Other comprehensive (loss)/income before reclassifications |  | 11 | (6) | (24) | 10
Amounts reclassified from AOCI |  |  |  |  |
Net current period Other comprehensive loss |  | 11 | (6) | (24) | 10
Ending balance |  | (158) | (157) | (158) | (157)
Unrealized Gains and Losses on Certain Investments |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Beginning balance |  | 2 |  | 2 |
Other comprehensive (loss)/income before reclassifications |  |  |  |  |
Amounts reclassified from AOCI |  |  |  |  |
Net current period Other comprehensive loss |  |  |  |  |
Ending balance |  | 2 |  | 2 |
Unrealized Gains and Losses on Derivative Instruments |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Beginning balance |  | (46) | (11) | 12 | (24)
Other comprehensive (loss)/income before reclassifications |  | (11) | (43) | (76) | (25)
Amounts reclassified from AOCI |  | 19 | 3 | 26 | (2)
Net current period Other comprehensive loss |  | 8 | (40) | (50) | (27)
Ending balance |  | (38) | (51) | (38) | (51)
Defined Benefit Pension Plans & Other Postretirement Benefits |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Beginning balance |  | (10,199) | (9,388) | (10,185) | (9,359)
Other comprehensive (loss)/income before reclassifications |  | 1 | 1 | (13) | (6)
Amounts reclassified from AOCI |  |  | (22) |  | (44)
Net current period Other comprehensive loss |  | 1 | (21) | (13) | (50)
Ending balance |  | $ (10,198) | $ (9,409) | $ (10,198) | $ (9,409)
[1] | Net of tax. (2) Primarily relates to the amortization of prior service credits and actuarial losses/(gains) included in net periodic benefit cost for the six and three months ended June 30, 2024 totaling $0 and $0 (net of tax of $0 and $0), and ($44) and ($22) (net of tax of $13 and $7) for the same periods in prior year.

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