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Investments and Fair Value Measurement - Investments (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Marketable Securities [Line Items]    
Short-term investments $ 1,084 $ 727
Restricted investments 7,019 4,779
Investments 8,460 6,101
Related Party    
Marketable Securities [Line Items]    
Note receivable from a related party 144 126
U.S. government and agency securities    
Marketable Securities [Line Items]    
Short-term investments 167 253
Restricted investments 5,552 4,426
Commercial paper    
Marketable Securities [Line Items]    
Short-term investments 220 288
Restricted investments 179 17
Corporate bonds    
Marketable Securities [Line Items]    
Short-term investments 659 181
Restricted investments 1,288 77
Certificates of deposit    
Marketable Securities [Line Items]    
Short-term investments 38 5
Restricted investments 0 259
Didi    
Marketable Securities [Line Items]    
Non-marketable equity securities 2,602 2,245
Grab    
Marketable Securities [Line Items]    
Marketable equity securities 2,529 1,806
Aurora    
Marketable Securities [Line Items]    
Marketable equity securities 2,054 1,425
Other    
Marketable Securities [Line Items]    
Non-marketable equity securities 608 329
Marketable equity securities $ 523 $ 170