Quarterly report pursuant to Section 13 or 15(d)

Leases - Subleases (Details)

v3.21.1
Leases - Subleases (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Leases [Abstract]      
Sublease payments to be received $ 0   $ 0
Sublease Income, Fixed 3 $ 37  
Sublease Income, Variable 1 15  
Sublease Income, Total $ 4 $ 52