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Fair Value Measurement of Assets and Liabilities - Financial Assets Measured and Recorded at Fair Value on a Non-Recurring Basis (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Assets:        
Equity investments measured at cost minus impairment $ 801 $ 779 $ 520 $ 497
Fair Value, measurements, not on a recurring basis        
Assets:        
Non-marketable equity investments measured using the Measurement Alternative 33 335    
Other assets 86 44    
Total financial assets 119 379    
Equity investments measured at cost minus impairment 768 444    
Fair Value, measurements, not on a recurring basis | Significant Other Observable Inputs (Level 2)        
Assets:        
Non-marketable equity investments measured using the Measurement Alternative 33 335    
Other assets 86 44    
Total financial assets $ 119 $ 379