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Cash, Cash Equivalents, and Marketable Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Cash, Cash Equivalents, and Short-term Investments $ 5,246 $ 8,920    
Total cash and cash equivalents 6,298 10,963    
Restricted Cash 108 128    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 6,406 11,091 $ 14,081 $ 14,996
Fair Value, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Cash and cash equivalents 1,052 2,043    
Fair Value, Recurring [Member] | Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Marketable securities 2,186 2,173    
US Government [Member] | Fair Value, Recurring [Member] | Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Cash and cash equivalents 40 711    
Marketable securities 325 864    
US Government Agencies [Member] | Fair Value, Recurring [Member] | Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Cash and cash equivalents 0 240    
Marketable securities 223 75    
Debt Security, Government, Non-US [Member] | Fair Value, Recurring [Member] | Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Cash and cash equivalents 382 152    
Marketable securities 1,184 697    
Corporate debt [Member] | Fair Value, Recurring [Member] | Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Cash and cash equivalents 630 940    
Marketable securities 274 304    
Other Debt Obligations [Member] | Fair Value, Recurring [Member] | Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Marketable securities $ 180 $ 233