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Employee Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Target allocation and pension plan asset allocation            
Contributions made to defined benefit pension plans $ 9 $ 2        
Estimated fair value of plan assets 185 171 $ 171 $ 185 $ 156 $ 171
Reconciliation of benefit obligation:            
Benefit obligation at beginning of year 293 300        
Service cost 8 10 9      
Interest cost 12 11 11      
Actuarial losses 50 (22)        
Plan settlements (9)          
Benefits paid (9) (6)        
Other 3          
Benefit obligation at end of year 348 293 300      
Reconciliation of fair value of plan assets:            
Fair value of plan assets at beginning of year 156 171        
Actual return on plan assets 35 (11)        
Employer contributions 9 2        
Plan settlements (9)          
Benefits paid (6) (6)        
Fair value of plan assets at end of year 185 156 171      
Funded status       (163) (137)  
Expected future net benefit payments            
2020       19    
2021       11    
2022       29    
2023       23    
2024       16    
Thereafter       82    
Components of net periodic benefit cost:            
Service cost 8 10 9      
Interest cost 12 11 11      
Expected return on plan assets (10) (11) (10)      
Amortization and other 5 6 5      
Settlement loss recognized 2   2      
Net periodic benefit cost 17 16 17      
Amounts not reflected in net periodic benefit cost and included in accumulated other comprehensive loss (AOCL) before taxes            
Total accumulated other comprehensive loss       88 72  
Other disclosures            
Contribution expense for multi-employer pension fund, the United Food and Commercial Workers International Union-Industry Pension Fund, which covers certain union employees under a collective bargaining agreement $ 1 1 $ 1      
Estimated withdrawal liability       14    
Time period over which quarterly installment payments will be made 20 years          
Defined benefit pension plan            
Target allocation and pension plan asset allocation            
Estimated fair value of plan assets $ 156 $ 156   185 156  
Weighted-average assumptions            
Expected return on plan assets (as a percent) 6.25% 6.25% 6.50%      
Long-term rate of increase in compensation levels (as a percent) 4.00% 4.00% 4.00%      
Reconciliation of fair value of plan assets:            
Fair value of plan assets at beginning of year $ 156          
Fair value of plan assets at end of year 185 $ 156        
Funded status       (53) (35)  
Expected future net benefit payments            
Accumulated benefit obligation       205 165  
Defined benefit pension plan | Level 1            
Target allocation and pension plan asset allocation            
Estimated fair value of plan assets 156 156   185 156  
Reconciliation of fair value of plan assets:            
Fair value of plan assets at beginning of year 156          
Fair value of plan assets at end of year 185 156        
Defined benefit pension plan | Domestic equity securities            
Target allocation and pension plan asset allocation            
Estimated fair value of plan assets 69 69   84 69  
Reconciliation of fair value of plan assets:            
Fair value of plan assets at beginning of year 69          
Fair value of plan assets at end of year 84 69        
Defined benefit pension plan | Domestic equity securities | Level 1            
Target allocation and pension plan asset allocation            
Estimated fair value of plan assets 69 69   84 69  
Reconciliation of fair value of plan assets:            
Fair value of plan assets at beginning of year 69          
Fair value of plan assets at end of year 84 69        
Defined benefit pension plan | Foreign equity securities            
Target allocation and pension plan asset allocation            
Estimated fair value of plan assets 47 47   57 47  
Reconciliation of fair value of plan assets:            
Fair value of plan assets at beginning of year 47          
Fair value of plan assets at end of year 57 47        
Defined benefit pension plan | Foreign equity securities | Level 1            
Target allocation and pension plan asset allocation            
Estimated fair value of plan assets 47 47   57 47  
Reconciliation of fair value of plan assets:            
Fair value of plan assets at beginning of year 47          
Fair value of plan assets at end of year 57 47        
Defined benefit pension plan | Fixed income            
Target allocation and pension plan asset allocation            
Estimated fair value of plan assets 27 27   30 27  
Reconciliation of fair value of plan assets:            
Fair value of plan assets at beginning of year 27          
Fair value of plan assets at end of year 30 27        
Defined benefit pension plan | Fixed income | Level 1            
Target allocation and pension plan asset allocation            
Estimated fair value of plan assets 27 27   30 27  
Reconciliation of fair value of plan assets:            
Fair value of plan assets at beginning of year 27          
Fair value of plan assets at end of year 30 27        
Defined benefit pension plan | Foreign fixed income mutual funds            
Target allocation and pension plan asset allocation            
Estimated fair value of plan assets 11 11   12 11  
Reconciliation of fair value of plan assets:            
Fair value of plan assets at beginning of year 11          
Fair value of plan assets at end of year 12 11        
Defined benefit pension plan | Foreign fixed income mutual funds | Level 1            
Target allocation and pension plan asset allocation            
Estimated fair value of plan assets 11 11   12 11  
Reconciliation of fair value of plan assets:            
Fair value of plan assets at beginning of year 11          
Fair value of plan assets at end of year 12 11        
Defined benefit pension plan | Money market funds            
Target allocation and pension plan asset allocation            
Estimated fair value of plan assets 2 2   2 2  
Reconciliation of fair value of plan assets:            
Fair value of plan assets at beginning of year 2          
Fair value of plan assets at end of year 2 2        
Defined benefit pension plan | Money market funds | Level 1            
Target allocation and pension plan asset allocation            
Estimated fair value of plan assets 2 2   $ 2 $ 2  
Reconciliation of fair value of plan assets:            
Fair value of plan assets at beginning of year 2          
Fair value of plan assets at end of year $ 2 $ 2        
Defined benefit pension plan | Minimum            
Weighted-average assumptions            
Discount rate used to determine obligations (as a percent)       2.15% 3.50% 2.75%
Discount rate used to determine net periodic benefit cost (as a percent) 3.50% 2.75% 2.90%      
Defined benefit pension plan | Minimum | Domestic equity securities            
Target allocation and pension plan asset allocation            
Target Allocations (as a percent)       50.00%    
Defined benefit pension plan | Minimum | Foreign equity securities            
Target allocation and pension plan asset allocation            
Target Allocations (as a percent)       25.00%    
Defined benefit pension plan | Minimum | Fixed income            
Target allocation and pension plan asset allocation            
Target Allocations (as a percent)       20.00%    
Defined benefit pension plan | Minimum | Alternative investments            
Target allocation and pension plan asset allocation            
Target Allocations (as a percent)       5.00%    
Defined benefit pension plan | Maximum            
Weighted-average assumptions            
Discount rate used to determine obligations (as a percent)       3.50% 4.50% 3.80%
Discount rate used to determine net periodic benefit cost (as a percent) 4.50% 3.80% 4.60%      
Supplemental executive plans and retirement agreements            
Expected future net benefit payments            
Accumulated benefit obligation       $ 104 $ 95