Quarterly report pursuant to Section 13 or 15(d)

Other Expenses and Charges Accrued Restructuring Rollforward (Details)

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Other Expenses and Charges Accrued Restructuring Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Restructuring Cost and Reserve [Line Items]    
Liability as of December 31, 2020 $ 10  
Costs Recognized 0 $ 13
Cash Payments (5)  
Liability as of March 31, 2021 5  
Employee Severance | 2020 Plans    
Restructuring Cost and Reserve [Line Items]    
Liability as of December 31, 2020 7  
Cash Payments (4)  
Liability as of March 31, 2021 3  
Facility Closing | 2020 Plans    
Restructuring Cost and Reserve [Line Items]    
Liability as of December 31, 2020 3  
Cash Payments (1)  
Liability as of March 31, 2021 $ 2  
Hotel Franchising    
Restructuring Cost and Reserve [Line Items]    
Costs Recognized   7
Corporate, Non-Segment    
Restructuring Cost and Reserve [Line Items]    
Costs Recognized   $ 5