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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)