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Fair Value Measurements - Financial Instruments Not Required to be Measured at Fair Value (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Carrying Value | Level 2    
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis    
Marketable securities, current $ 203 $ 127
Carrying Value | Level 2 | 2023 Notes    
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis    
Debt 187 193
Carrying Value | Level 2 | 2024 Notes    
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis    
Debt 379 379
Carrying Value | Level 2 | 2028 Notes    
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis    
Debt 596 596
Carrying Value | Level 2 | Other borrowings    
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis    
Debt 34 24
Carrying Value | Level 3    
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis    
Notes receivable, including noncurrent portion 11 11
Carrying Value | Cash | Level 1    
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis    
Cash and cash equivalents 1,194 1,295
Carrying Value | Cash equivalents | Level 2    
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis    
Cash and cash equivalents 719 914
Fair Value | Level 2    
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis    
Marketable securities, current 203 127
Fair Value | Level 2 | 2023 Notes    
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis    
Debt 189 196
Fair Value | Level 2 | 2024 Notes    
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis    
Debt 381 399
Fair Value | Level 2 | 2028 Notes    
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis    
Debt 592 630
Fair Value | Level 2 | Other borrowings    
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis    
Debt 34 24
Fair Value | Level 3    
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis    
Notes receivable, including noncurrent portion 11 11
Fair Value | Cash | Level 1    
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis    
Cash and cash equivalents 1,194 1,295
Fair Value | Cash equivalents | Level 2    
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis    
Cash and cash equivalents $ 719 $ 914