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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, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance |  |  | $ (10,305) |
Other comprehensive (loss)/income before reclassifications | $ 119 | $ (72) | 6 | $ (93)
Amounts reclassified from AOCI |  | (19) | 26 | (65)
Net current period Other comprehensive income/(loss) | 119 | (91) | 32 | (158)
Ending balance | (10,273) |  | (10,273) |
Other comprehensive (income) loss, defined benefit plan, reclassification adjustment from AOCI, after tax |  | (23) |  | (67)
Other comprehensive (income) loss, defined benefit plan, reclassification adjustment from AOCI, tax |  | (5) |  | (18)
Accumulated Other Comprehensive Loss |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance | (10,392) | (9,617) | (10,305) | (9,550)
Ending balance | (10,273) | (9,708) | (10,273) | (9,708)
Currency Translation Adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance | (158) | (157) | (134) | (167)
Other comprehensive (loss)/income before reclassifications | 54 | (39) | 30 | (29)
Amounts reclassified from AOCI |  |  |  |
Net current period Other comprehensive income/(loss) | 54 | (39) | 30 | (29)
Ending balance | (104) | (196) | (104) | (196)
Unrealized Gains and Losses on Certain Investments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance | 2 |  | 2 |
Other comprehensive (loss)/income before reclassifications | 1 | 1 | 1 | 1
Amounts reclassified from AOCI |  |  |  |
Net current period Other comprehensive income/(loss) | 1 | 1 | 1 | 1
Ending balance | 3 | 1 | 3 | 1
Unrealized Gains and Losses on Derivative Instruments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance | (38) | (51) | 12 | (24)
Other comprehensive (loss)/income before reclassifications | 63 | (35) | (13) | (60)
Amounts reclassified from AOCI |  | 4 | 26 | 2
Net current period Other comprehensive income/(loss) | 63 | (31) | 13 | (58)
Ending balance | 25 | (82) | 25 | (82)
Defined Benefit Pension Plans & Other Postretirement Benefits |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance | (10,198) | (9,409) | (10,185) | (9,359)
Other comprehensive (loss)/income before reclassifications | 1 | 1 | (12) | (5)
Amounts reclassified from AOCI |  | (23) |  | (67)
Net current period Other comprehensive income/(loss) | 1 | (22) | (12) | (72)
Ending balance | $ (10,197) | $ (9,431) | $ (10,197) | $ (9,431)

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