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Investments - Narrative (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]    
Equity Method Investments $ 33 $ 31
Cost Method Investments 3 $ 4
Commercial Paper [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 3  
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 0  
Commercial Paper [Member] | Maximum    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss $ 1