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Other (Income) Expense - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
May 31, 2017
Other Expense [Line Items]        
Deconsolidation, gain (loss), gross   $ 286,000,000    
Professional fees   14,000,000    
Gain (loss) related to settlement $ 11,000,000 53,000,000    
Interest income, tax settlement 8,000,000 38,000,000 $ 0  
Loss from catastrophes $ 25,000,000 $ 12,000,000 14,000,000  
Senior Notes | 6.5% due 2021        
Other Expense [Line Items]        
Redemption premium     $ 25,000,000  
Senior Notes | 7% due 2022        
Other Expense [Line Items]        
Debt instrument, principal amount       $ 700,000,000
Interest rate, stated percentage       7.00%