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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | $ 4,086 | $ 3,761 | $ 4,037 | $ 3,601
Other comprehensive income (loss): |  |  |  |
Total Other comprehensive income (loss), net of tax | 3 | (2) | (28) | 33
Ending balance | 4,277 | 3,775 | 4,277 | 3,775
Accumulated other comprehensive loss |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (1,861) | (1,806) | (1,830) | (1,841)
Other comprehensive income (loss): |  |  |  |
Total Other comprehensive income (loss), net of tax | 3 | (2) | (28) | 33
Ending balance | (1,858) | (1,808) | (1,858) | (1,808)
Pension and other postretirement benefits |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (686) | (648) | (689) | (653)
Other comprehensive income (loss): |  |  |  |
Unrecognized net actuarial (loss) gain and prior service cost/benefit and net change from periodic revaluations | 0 | (3) | (1) | 0
Tax (expense) benefit | 0 | 1 | 0 | 0
Total Other comprehensive income (loss) before reclassifications, net of tax | 0 | (2) | (1) | 0
Amortization of net actuarial loss and prior service cost and net amount reclassified to earnings | 5 | 8 | 10 | 12
Tax benefit (expense) | (1) | (2) | (2) | (3)
Total amount reclassified from Accumulated other comprehensive (loss) income, net of tax | 4 | 6 | 8 | 9
Total Other comprehensive income (loss), net of tax | 4 | 4 | 7 | 9
Ending balance | (682) | (644) | (682) | (644)
Foreign currency translation |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (1,173) | (1,159) | (1,136) | (1,193)
Other comprehensive income (loss): |  |  |  |
Total Other comprehensive income (loss), net of tax | (4) | 4 | (41) | 38
Ending balance | (1,177) | (1,155) | (1,177) | (1,155)
Cash flow hedges |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (2) | 1 | (5) | 5
Other comprehensive income (loss): |  |  |  |
Unrecognized net actuarial (loss) gain and prior service cost/benefit and net change from periodic revaluations | 4 | (10) | 3 | (14)
Tax (expense) benefit | (1) | 2 | (1) | 3
Total Other comprehensive income (loss) before reclassifications, net of tax | 3 | (8) | 2 | (11)
Amortization of net actuarial loss and prior service cost and net amount reclassified to earnings | 0 | (3) | 5 | (4)
Tax benefit (expense) | 0 | 1 | (1) | 1
Total amount reclassified from Accumulated other comprehensive (loss) income, net of tax | 0 | (2) | 4 | (3)
Total Other comprehensive income (loss), net of tax | 3 | (10) | 6 | (14)
Ending balance | $ 1 | $ (9) | $ 1 | $ (9)

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