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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Amount |  |  |  |  |  |  |
U.S. federal statutory tax |  |  |  |  | $ (421) | $ (1,054) | $ (1,057)
Valuation allowance |  |  |  |  | 1,150 | 1,199 | 512
Research and development credits |  |  |  |  | (472) | (204) | (189)
State income tax provision, net of effects on U.S. federal tax |  |  |  |  | (75) | (90) | (94)
Tax on non-U.S. activities |  |  |  |  | 35 | 64 | 47
Impact of subsidiary shares purchased from noncontrolling interests |  |  |  |  | (29) |  |
Other provision adjustments |  |  |  |  | 49 | 116 | 38
Total income tax expense/(benefit) | $ (76) | $ (251) | $ (99) | $ (322) | $ (237) | $ (31) | $ (743)
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |  |  |  |
U.S. federal statutory tax |  |  |  |  | 21.00% | 21.00% | 21.00%
Valuation allowance |  |  |  |  | (57.30%) | (23.90%) | (10.20%)
Research and development credits |  |  |  |  | 23.60% | 4.10% | 3.80%
State income tax provision, net of effects on U.S. federal tax |  |  |  |  | 3.70% | 1.80% | 1.90%
Tax on non-U.S. activities |  |  |  |  | (1.80%) | (1.30%) | (0.90%)
Impact of subsidiary shares purchased from noncontrolling interests |  |  |  |  | 1.50% |  |
Other provision adjustments |  |  |  |  | (2.50%) | (2.30%) | (0.90%)
Effective income tax rate |  |  | 5.20% | 35.90% | (11.80%) | (0.60%) | 14.70%

X
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