Annual report pursuant to Section 13 and 15(d)

Retirement Plan (Details)

v3.19.3.a.u2
Retirement Plan (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Retirement Benefits [Abstract]      
Defined contribution plan covered employee, age (at least) 21 years    
Defined contribution plan matching contribution expense $ 64 $ 53 $ 42