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Fair Value - Fair Value Hierarchy (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Assets    
Available-for-sale investment securities $ 936 $ 800
Fair Value, Recurring    
Assets    
Cash equivalents 1,143 1,515
Available-for-sale investment securities 936 800
Equity investment securities 24 26
Fair Value, Recurring | Level 1    
Assets    
Cash equivalents 1,128 1,515
Available-for-sale investment securities 0 0
Equity investment securities 24 26
Fair Value, Recurring | Level 2    
Assets    
Cash equivalents 15 0
Available-for-sale investment securities 936 800
Equity investment securities 0 0
Fair Value, Recurring | Level 3    
Assets    
Cash equivalents 0 0
Available-for-sale investment securities 0 0
Equity investment securities $ 0 $ 0