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Acquisitions and Sale of Businesses - Narrative on sale of businesses (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2020
Sale of Businesses        
Proceeds from sale of businesses $ 3 $ 0 $ 0  
Income tax expense (benefit) 127 $ 239 $ 122  
Neon Capital Limited        
Sale of Businesses        
Proceeds from sale of businesses $ 6      
Carrying value of assets and liabilities disposed, percentage of total assets and liabilities 1.00%      
Income tax expense (benefit) $ (72)      
Neon Capital Limited Executives | Neon Capital Limited        
Sale of Businesses        
Percent of noncontrolling interest acquired from former and current Neon executives       100.00%