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Benefit Plans and Other Postretirement Benefits - Net Benefit Costs and Funded Status (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Annual periodic pension cost        
Curtailment gain $ (8)      
Pension and other post retirement benefit obligations        
Curtailment gain $ (32)      
Pension Benefits        
Annual periodic pension cost        
Service cost benefits earned   $ 10 $ 23 $ 26
Interest cost on benefit obligation   46 44 43
Expected return on plan assets   (59) (62) (58)
Amortization of unrecognized net loss   3 0 4
Curtailment gain   0 7 0
Net periodic benefit cost   0 12 15
Pension and other post retirement benefit obligations        
Benefit obligation at January 1   1,222 1,329  
Service cost   10 23 26
Interest cost   46 44 43
Plan amendments   0 17  
Actuarial (gain)/loss   207 (95)  
Employee and retiree contributions   0 0  
Curtailment gain   0 (20)  
Benefit payments   (88) (76)  
Benefit obligation at December 31   1,397 1,222 1,329
Fair value of plan assets for pension and other post retirement benefit        
Fair value of plan assets at January 1   981 1,104  
Actual return on plan assets   216 (80)  
Employee and retiree contributions   0 0  
Employer contributions   41 33  
Benefit payments   (88) (76)  
Fair value of plan assets at December 31   1,150 981 1,104
Funded status at December 31 — excess of obligation over assets   (247) (241)  
Other Postretirement Benefits Plan        
Annual periodic pension cost        
Service cost benefits earned   1 1 1
Interest cost on benefit obligation   3 4 4
Amortization of unrecognized prior service credit   (13) (10) (9)
Amortization of unrecognized net loss   0 0 (1)
Curtailment gain   0 (10) 0
Net periodic benefit cost   (9) (15) (5)
Pension and other post retirement benefit obligations        
Benefit obligation at January 1   83 128  
Service cost   1 1 1
Interest cost   3 4 4
Plan amendments   (2) (28)  
Actuarial (gain)/loss   16 (6)  
Employee and retiree contributions   4 3  
Curtailment gain   0 (7)  
Benefit payments   (12) (12)  
Benefit obligation at December 31   93 83 128
Fair value of plan assets for pension and other post retirement benefit        
Fair value of plan assets at January 1   0 0  
Actual return on plan assets   0 0  
Employee and retiree contributions   4 3  
Employer contributions   7 9  
Benefit payments   (11) (12)  
Fair value of plan assets at December 31   0 0 $ 0
Funded status at December 31 — excess of obligation over assets   $ (93) $ (83)