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Allowances for Losses on Financial Assets - Schedule of Financial Assets, Allowance for Credit Loss (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Contract with Customer, Asset, Allowance for Credit Loss [Roll Forward] |  |  |  |
Account receivable, allowance for credit loss, beginning balance | $ (89) | $ (116) | $ (116) | $ (390)
Unbilled receivables, allowance for credit loss, beginning balance | (19) | (23) | (23) | (91)
Allowance for credit loss, beginning balance | (331) | (367) | (367) | (747)
Customer financing, allowance for credit loss, beginning balance | (51) | (55) | (55) | (18)
Accounts receivable, changes in estimates | (15) | (5) | (6) | 2
Unbilled receivables, changes in estimates | (1) | 2 | 4 | 21
Customer financing, changes in estimates, rounding |  |  |  | (37)
Customer financing, changes in estimates | 35 | 2 | 4 |
Changes in estimates |  |  | (2) | (76)
Accounts receivable, write-offs | 7 | 24 | 29 | 260
Unbilled receivables, write-offs |  |  |  | 47
Write-offs | 17 | 28 | 34 | 444
Accounts receivable, recovery | 1 | 2 | 4 | 12
Recoveries | 1 | 2 | 4 | 12
Account receivable, allowance for credit loss, ending balance | (96) | (95) | (89) | (116)
Unbilled receivables, allowance for credit loss, ending balance | (20) | (21) | (19) | (23)
Allowance for credit loss, ending balance | (342) | (335) | (331) | (367)
Customer financing, allowance for credit loss, ending balance | (16) | (53) | (51) | (55)
Changes in estimates | (29) | 2 |  |
Other current assets |  |  |  |
Contract with Customer, Asset, Allowance for Credit Loss [Roll Forward] |  |  |  |
Allowance for credit loss, beginning balance | (50) | (85) | (85) | (62)
Changes in estimates |  |  | 30 | (27)
Write-offs | 10 | 4 | 5 | 4
Allowance for credit loss, ending balance | (41) | (66) | (50) | (85)
Changes in estimates | (1) | 15 |  |
Other assets |  |  |  |
Contract with Customer, Asset, Allowance for Credit Loss [Roll Forward] |  |  |  |
Allowance for credit loss, beginning balance | (122) | (88) | (88) | (186)
Changes in estimates |  |  | (34) | (35)
Write-offs |  |  |  | 133
Allowance for credit loss, ending balance | (169) | (100) | $ (122) | $ (88)
Changes in estimates | $ (47) | $ (12) |  |

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