Quarterly report pursuant to Section 13 or 15(d)

Assets and Liabilities Measured at Fair Value - Assets And Liabilities Measured At Fair Value On A Recurring Basis (Details)

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Assets and Liabilities Measured at Fair Value - Assets And Liabilities Measured At Fair Value On A Recurring Basis (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Recurring    
Assets and liabilities measured at fair value    
Cash equivalents $ 248 $ 339
Indemnification asset 180 202
Debt 1,332 1,557
Recurring | Level 1    
Assets and liabilities measured at fair value    
Cash equivalents 248 339
Recurring | Level 2    
Assets and liabilities measured at fair value    
Indemnification asset 180 202
Debt $ 1,332 $ 1,557
1.75% Exchangeable Senior Debentures due 2046    
Assets and liabilities measured at fair value    
Interest rate (as a percent) 1.75%  
Exchangeable debenture securities outstanding 332,241