Annual report pursuant to Section 13 and 15(d)

Leases - Subleases (Details)

v3.20.4
Leases - Subleases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Sublease payments to be received $ 0 $ 9
Sublease Income, Fixed 68 122
Sublease Income, Variable 27 22
Sublease Income, Total $ 95 $ 144