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Employee Benefit Plans - Narrative (Details) - USD ($)
 12 Months Ended
Jan. 20, 2020
Jan. 01, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]          
Increase (decrease) in post-retirement benefit liability       $ (102,000,000)  
Employer contributions     $ 0 0 $ 0
Expected future contributions     0    
Pension plan assets at fair value     2,825,000,000 2,431,000,000  
Special termination benefits         56,000,000
Amount of premium expenses incurred under the plan     26,000,000 30,000,000 40,000,000
Expense associated with savings plans     $ 41,000,000 41,000,000 39,000,000
Equity          
Defined Benefit Plan Disclosure [Line Items]          
Targeted allocation of total plan assets in domestic equity     37.00%    
Targeted allocation of total plan assets in international equity     23.00%    
Percentage within which the planned allocation is managed     3.00%    
Pension plan assets at fair value     $ 1,770,000,000 1,698,000,000  
Fixed Income          
Defined Benefit Plan Disclosure [Line Items]          
Target allocation percentage of pension assets     40.00%    
Pension plan assets at fair value     $ 818,000,000 704,000,000  
Pension and Other Post-Employment Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Gain (loss) recognized in other comprehensive income       102,000,000  
Post-retirement benefits          
Defined Benefit Plan Disclosure [Line Items]          
Life insurance and contributions to the medical program for eligible retirees will be eliminated (younger than)   65 years      
Increase (decrease) in post-retirement benefit liability     0 102,000,000  
Pension plan assets at fair value     0 0 0
Special termination benefits     0 0 13,000,000
Curtailment losses         13,000,000
Pre-tax (loss) gain to be amortized     74,000,000    
Post-retirement benefits | Nonqualified Plan          
Defined Benefit Plan Disclosure [Line Items]          
Employer contributions     26,000,000 30,000,000  
Pension Plans          
Defined Benefit Plan Disclosure [Line Items]          
Increase (decrease) in post-retirement benefit liability     0 0  
Pension plan assets at fair value     2,825,000,000 2,431,000,000 2,833,000,000
Decrease to pension liabilities         85,000,000
Special termination benefits     0 0 60,000,000
Curtailment losses         4,000,000
Pre-tax (loss) gain to be amortized     (879,000,000)    
Pension Plans | Qualified Plan          
Defined Benefit Plan Disclosure [Line Items]          
Settlement losses         11,000,000
Pension Plans | Nonqualified Plan          
Defined Benefit Plan Disclosure [Line Items]          
Employer contributions     $ 17,000,000 $ 17,000,000  
Settlement losses         $ 12,000,000
Subsequent Event | Plan | Post-retirement benefits          
Defined Benefit Plan Disclosure [Line Items]          
Life insurance and contributions to the medical program for eligible retirees will be eliminated (65 or older) 65 years