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Employee Benefits (Details)
$ in Millions
1 Months Ended 12 Months Ended
Sep. 28, 2013
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2015
USD ($)
plan
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Jul. 27, 2013
Target allocation and pension plan asset allocation                
Contributions made to defined benefit pension plans   $ 4 $ 3          
Estimated fair value of plan assets   122 120 $ 120 $ 114 $ 122 $ 120  
Reconciliation of benefit obligation:                
Benefit obligation at beginning of year   257 203          
Service cost   10 8 9        
Interest cost   10 10 8        
Actuarial losses (gains)   (18) 44          
Benefits paid   (8) (7)          
Plan settlement   (2) (1)          
Benefit obligation at end of year   249 257 203        
Reconciliation of fair value of plan assets:                
Fair value of plan assets at beginning of year   122 120          
Actual return on plan assets   (4) 7          
Employer contributions   4 3          
Benefits paid   (8) (7)          
Plan settlement     (1)          
Fair value of plan assets at end of year   114 122 120        
Expected future net benefit payments                
2016         12      
2017         12      
2018         14      
2019         13      
2020         15      
2021 - 2025         85      
Agreement termination gain, before tax   1   3        
Agreement termination gain, net of tax       2        
Agreement termination gain unrecognized in other comprehensive income, before tax       2        
Agreement termination gain unrecognized in other comprehensive income, net of tax       1        
Funded status         (135) (135)    
Components of net periodic benefit cost:                
Service cost   10 8 9        
Interest cost   10 10 8        
Expected return on plan assets   (8) (9) (6)        
Amortization and other   5 2 6        
Agreement termination gain   (1)   (3)        
Net periodic benefit cost   16 11 14        
Amounts not reflected in net periodic benefit cost and included in accumulated other comprehensive loss (AOCL) before taxes                
Total accumulated other comprehensive loss         $ 72 86    
Amounts in AOCL expected to be recognized as components of net periodic benefit cost in 2016                
Amounts in AOCL expected to be recognized as components of net periodic benefit cost in 2016   4            
Contribution expense for multi-employer pension fund, the United Food & Commercial Workers International Union-Industry Pension Fund, which covers certain union employees under a collective bargaining agreement   $ 1 $ 1 $ 1        
Maximum percentage of total contributions to multi-employer pension fund   5.00% 5.00% 5.00%        
Defined benefit pension plan                
Target allocation and pension plan asset allocation                
Number of defined benefit plans | plan         2      
Requisite service period upon attaining age of 21 to be eligible for participation   1 year            
Requisite age of employees to be eligible for participation   21 years            
Contributions made to defined benefit pension plans $ 10              
Estimated fair value of plan assets   $ 122 $ 122   $ 114 122    
Weighted-average assumptions                
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   $ 122            
Employer contributions $ 10              
Fair value of plan assets at end of year   114 $ 122          
Expected future net benefit payments                
Funded status         (50) (48)    
Accumulated benefit obligation         143 144    
Defined benefit pension plan | Level 1                
Target allocation and pension plan asset allocation                
Estimated fair value of plan assets   117 117   109 117    
Reconciliation of fair value of plan assets:                
Fair value of plan assets at beginning of year   117            
Fair value of plan assets at end of year   109 117          
Defined benefit pension plan | Level 2                
Target allocation and pension plan asset allocation                
Estimated fair value of plan assets   5 5   5 5    
Reconciliation of fair value of plan assets:                
Fair value of plan assets at beginning of year   5            
Fair value of plan assets at end of year   5 5          
Defined benefit pension plan | Foreign equity securities                
Target allocation and pension plan asset allocation                
Estimated fair value of plan assets   28 28   27 28    
Reconciliation of fair value of plan assets:                
Fair value of plan assets at beginning of year   28            
Fair value of plan assets at end of year   27 28          
Defined benefit pension plan | Foreign equity securities | Level 1                
Target allocation and pension plan asset allocation                
Estimated fair value of plan assets   28 28   27 28    
Reconciliation of fair value of plan assets:                
Fair value of plan assets at beginning of year   28            
Fair value of plan assets at end of year   27 28          
Defined benefit pension plan | Domestic equity securities                
Target allocation and pension plan asset allocation                
Estimated fair value of plan assets   67 67   64 67    
Reconciliation of fair value of plan assets:                
Fair value of plan assets at beginning of year   67            
Fair value of plan assets at end of year   64 67          
Defined benefit pension plan | Domestic equity securities | Level 1                
Target allocation and pension plan asset allocation                
Estimated fair value of plan assets   67 67   64 67    
Reconciliation of fair value of plan assets:                
Fair value of plan assets at beginning of year   67            
Fair value of plan assets at end of year   64 67          
Defined benefit pension plan | Real estate mutual fund                
Target allocation and pension plan asset allocation                
Estimated fair value of plan assets   9 9   8 9    
Reconciliation of fair value of plan assets:                
Fair value of plan assets at beginning of year   9            
Fair value of plan assets at end of year   8 9          
Defined benefit pension plan | Real estate mutual fund | Level 1                
Target allocation and pension plan asset allocation                
Estimated fair value of plan assets   9 9   8 9    
Reconciliation of fair value of plan assets:                
Fair value of plan assets at beginning of year   9            
Fair value of plan assets at end of year   8 9          
Defined benefit pension plan | Fixed income mutual funds                
Target allocation and pension plan asset allocation                
Estimated fair value of plan assets   2 2   5 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   5 2          
Defined benefit pension plan | Fixed income mutual funds | Level 1                
Target allocation and pension plan asset allocation                
Estimated fair value of plan assets   2 2   5 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   5 2          
Defined benefit pension plan | Commodity mutual funds                
Target allocation and pension plan asset allocation                
Estimated fair value of plan assets   4 4   2 4    
Reconciliation of fair value of plan assets:                
Fair value of plan assets at beginning of year   4            
Fair value of plan assets at end of year   2 4          
Defined benefit pension plan | Commodity mutual funds | Level 1                
Target allocation and pension plan asset allocation                
Estimated fair value of plan assets   4 4   2 4    
Reconciliation of fair value of plan assets:                
Fair value of plan assets at beginning of year   4            
Fair value of plan assets at end of year   2 4          
Defined benefit pension plan | International fixed income mutual funds                
Target allocation and pension plan asset allocation                
Estimated fair value of plan assets   4 4   1 4    
Reconciliation of fair value of plan assets:                
Fair value of plan assets at beginning of year   4            
Fair value of plan assets at end of year   1 4          
Defined benefit pension plan | International fixed income mutual funds | Level 1                
Target allocation and pension plan asset allocation                
Estimated fair value of plan assets   4 4   1 4    
Reconciliation of fair value of plan assets:                
Fair value of plan assets at beginning of year   4            
Fair value of plan assets at end of year   1 4          
Defined benefit pension plan | Money market funds                
Target allocation and pension plan asset allocation                
Estimated fair value of plan assets   3 3   2 3    
Reconciliation of fair value of plan assets:                
Fair value of plan assets at beginning of year   3            
Fair value of plan assets at end of year   2 3          
Defined benefit pension plan | Money market funds | Level 1                
Target allocation and pension plan asset allocation                
Estimated fair value of plan assets   3 3   2 3    
Reconciliation of fair value of plan assets:                
Fair value of plan assets at beginning of year   3            
Fair value of plan assets at end of year   2 3          
Defined benefit pension plan | Other                
Target allocation and pension plan asset allocation                
Estimated fair value of plan assets   5 5   5 5    
Reconciliation of fair value of plan assets:                
Fair value of plan assets at beginning of year   5            
Fair value of plan assets at end of year   5 5          
Defined benefit pension plan | Other | Level 2                
Target allocation and pension plan asset allocation                
Estimated fair value of plan assets   5 5   $ 5 $ 5    
Reconciliation of fair value of plan assets:                
Fair value of plan assets at beginning of year   5            
Fair value of plan assets at end of year   $ 5 $ 5          
Defined benefit pension plan | Minimum                
Weighted-average assumptions                
Discount rate used to determine obligations (as a percent)         3.20% 3.15% 3.55%  
Discount rate used to determine net periodic benefit cost (as a percent)   2.70% 3.55% 2.50%        
Expected return on plan assets (as a percent)   6.75% 7.00% 6.50%        
Defined benefit pension plan | Minimum | Foreign equity securities                
Target allocation and pension plan asset allocation                
Target Allocations (as a percent)               20.00%
Defined benefit pension plan | Minimum | Fixed income                
Target allocation and pension plan asset allocation                
Target Allocations (as a percent)               10.00%
Defined benefit pension plan | Minimum | Alternative investments                
Target allocation and pension plan asset allocation                
Target Allocations (as a percent)               10.00%
Defined benefit pension plan | Minimum | Domestic equity securities                
Target allocation and pension plan asset allocation                
Target Allocations (as a percent)               40.00%
Defined benefit pension plan | Maximum                
Weighted-average assumptions                
Discount rate used to determine obligations (as a percent)         4.80% 4.40% 5.20%  
Discount rate used to determine net periodic benefit cost (as a percent)   4.40% 5.20% 4.15%        
Expected return on plan assets (as a percent)   7.50% 8.00% 7.25%        
Defined benefit pension plan | Maximum | Foreign equity securities                
Target allocation and pension plan asset allocation                
Target Allocations (as a percent)               25.00%
Defined benefit pension plan | Maximum | Fixed income                
Target allocation and pension plan asset allocation                
Target Allocations (as a percent)               25.00%
Defined benefit pension plan | Maximum | Alternative investments                
Target allocation and pension plan asset allocation                
Target Allocations (as a percent)               15.00%
Defined benefit pension plan | Maximum | Domestic equity securities                
Target allocation and pension plan asset allocation                
Target Allocations (as a percent)               50.00%
Supplemental executive plans and retirement agreements                
Expected future net benefit payments                
Accumulated benefit obligation         $ 73 $ 73