v3.19.3.a.u2
Employee Benefit Plans - Severances (Details) - Employee Severance [Member]
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Supplemental Unemployment Benefits [Line Items]  
Balance at December 31, 2018 $ 48
Accruals (1)
Benefit payments (24)
Balance at December 31, 2019 23
Short term supplemental unemployment benefits [Member]  
Supplemental Unemployment Benefits [Line Items]  
Balance at December 31, 2019 $ 5