Quarterly report pursuant to Section 13 or 15(d)

Leases - Subleases (Details)

v3.21.2
Leases - Subleases (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Leases [Abstract]          
Sublease payments to be received $ 0   $ 0   $ 0
Sublease Income, Fixed 17 $ 9 28 $ 61  
Sublease Income, Variable 15 1 21 24  
Sublease Income, Total $ 32 $ 10 $ 49 $ 85