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Employee Benefits (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
item
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2017
USD ($)
plan
Jan. 01, 2017
plan
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Target allocation and pension plan asset allocation              
Contributions made to defined benefit pension plans $ 10 $ 40          
Estimated fair value of plan assets 151 114 $ 114 $ 171   $ 151 $ 114
Reconciliation of benefit obligation:              
Benefit obligation at beginning of year 262 249          
Service cost 9 9 10        
Interest cost 11 11 10        
Actuarial losses 29 6          
Plan settlements (9)            
Benefits paid (3) (13)          
Other 1            
Benefit obligation at end of year 300 262 249        
Reconciliation of fair value of plan assets:              
Fair value of plan assets at beginning of year 151 114          
Actual return on plan assets 25 10          
Employer contributions 10 40          
Plan settlements (9)            
Benefits paid (6) (13)          
Fair value of plan assets at end of year 171 151 114        
Expected future net benefit payments              
2018       12      
2019       14      
2020       17      
2021       13      
2022       23      
2023 - 2027       78      
Agreement termination gain, before tax     1        
Funded status       (129)   (111)  
Components of net periodic benefit cost:              
Service cost 9 9 10        
Interest cost 11 11 10        
Expected return on plan assets (10) (8) (8)        
Amortization and other 5 5 5        
Settlement loss recognized 2            
Agreement termination gain     (1)        
Net periodic benefit cost 17 17 16        
Amounts not reflected in net periodic benefit cost and included in accumulated other comprehensive loss (AOCL) before taxes              
Total accumulated other comprehensive loss       78   72  
Amounts in AOCL expected to be recognized as components of net periodic benefit cost in 2018              
Amounts in AOCL expected to be recognized as components of net periodic benefit cost in 2018       $ 5      
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%        
Assets exceed accumulated benefits              
Target allocation and pension plan asset allocation              
Contributions made to defined benefit pension plans   $ 39          
Estimated fair value of plan assets $ 87 46 $ 46     87 46
Reconciliation of benefit obligation:              
Benefit obligation at beginning of year 73 70          
Service cost   4          
Interest cost   3          
Benefits paid   (4)          
Benefit obligation at end of year   73 70        
Reconciliation of fair value of plan assets:              
Fair value of plan assets at beginning of year 87 46          
Actual return on plan assets   6          
Employer contributions   39          
Benefits paid   (4)          
Fair value of plan assets at end of year   87 46        
Expected future net benefit payments              
Funded status           14  
Components of net periodic benefit cost:              
Service cost   4          
Interest cost   3          
Accumulated benefits exceed assets              
Target allocation and pension plan asset allocation              
Contributions made to defined benefit pension plans   1          
Estimated fair value of plan assets 64 68 68     64 $ 68
Reconciliation of benefit obligation:              
Benefit obligation at beginning of year 189 179          
Service cost   5          
Interest cost   8          
Actuarial losses   6          
Benefits paid   (9)          
Benefit obligation at end of year   189 179        
Reconciliation of fair value of plan assets:              
Fair value of plan assets at beginning of year $ 64 68          
Actual return on plan assets   4          
Employer contributions   1          
Benefits paid   (9)          
Fair value of plan assets at end of year   64 $ 68        
Expected future net benefit payments              
Funded status           (125)  
Components of net periodic benefit cost:              
Service cost   5          
Interest cost   8          
Defined benefit pension plan              
Target allocation and pension plan asset allocation              
Number of defined benefit plans | plan       1 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   39          
Estimated fair value of plan assets $ 151 $ 151   $ 171   151  
Weighted-average assumptions              
Expected return on plan assets (as a percent) 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 $ 151            
Employer contributions   $ 39          
Fair value of plan assets at end of year $ 171 151          
Expected future net benefit payments              
Funded status       (29)   (15)  
Accumulated benefit obligation       171   142  
Number of participants who received lump sum payments | item 3            
Lump sum payments $ 8            
Defined benefit pension plan | Level 1              
Target allocation and pension plan asset allocation              
Estimated fair value of plan assets 146 146   171   146  
Reconciliation of fair value of plan assets:              
Fair value of plan assets at beginning of year 146            
Fair value of plan assets at end of year 171 146          
Defined benefit pension plan | Level 2              
Target allocation and pension plan asset allocation              
Estimated fair value of plan assets 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          
Defined benefit pension plan | Domestic equity securities              
Target allocation and pension plan asset allocation              
Estimated fair value of plan assets 76 76   80   76  
Reconciliation of fair value of plan assets:              
Fair value of plan assets at beginning of year 76            
Fair value of plan assets at end of year 80 76          
Defined benefit pension plan | Domestic equity securities | Level 1              
Target allocation and pension plan asset allocation              
Estimated fair value of plan assets 76 76   80   76  
Reconciliation of fair value of plan assets:              
Fair value of plan assets at beginning of year 76            
Fair value of plan assets at end of year 80 76          
Defined benefit pension plan | Foreign equity securities              
Target allocation and pension plan asset allocation              
Estimated fair value of plan assets 35 35   53   35  
Reconciliation of fair value of plan assets:              
Fair value of plan assets at beginning of year 35            
Fair value of plan assets at end of year 53 35          
Defined benefit pension plan | Foreign equity securities | Level 1              
Target allocation and pension plan asset allocation              
Estimated fair value of plan assets 35 35   53   35  
Reconciliation of fair value of plan assets:              
Fair value of plan assets at beginning of year 35            
Fair value of plan assets at end of year 53 35          
Defined benefit pension plan | Fixed income              
Target allocation and pension plan asset allocation              
Estimated fair value of plan assets 17 17   25   17  
Reconciliation of fair value of plan assets:              
Fair value of plan assets at beginning of year 17            
Fair value of plan assets at end of year 25 17          
Defined benefit pension plan | Fixed income | Level 1              
Target allocation and pension plan asset allocation              
Estimated fair value of plan assets 17 17   25   17  
Reconciliation of fair value of plan assets:              
Fair value of plan assets at beginning of year 17            
Fair value of plan assets at end of year 25 17          
Defined benefit pension plan | Real estate mutual fund              
Target allocation and pension plan asset allocation              
Estimated fair value of plan assets 8 8       8  
Reconciliation of fair value of plan assets:              
Fair value of plan assets at beginning of year 8            
Fair value of plan assets at end of year   8          
Defined benefit pension plan | Real estate mutual fund | Level 1              
Target allocation and pension plan asset allocation              
Estimated fair value of plan assets 8 8       8  
Reconciliation of fair value of plan assets:              
Fair value of plan assets at beginning of year 8            
Fair value of plan assets at end of year   8          
Defined benefit pension plan | Commodity mutual funds              
Target allocation and pension plan asset allocation              
Estimated fair value of plan assets 4 4       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   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       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   4          
Defined benefit pension plan | Money market 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 | Money market 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 | Foreign fixed income mutual funds              
Target allocation and pension plan asset allocation              
Estimated fair value of plan assets 2 2   11   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 11 2          
Defined benefit pension plan | Foreign fixed income mutual funds | Level 1              
Target allocation and pension plan asset allocation              
Estimated fair value of plan assets 2 2   $ 11   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 11 2          
Defined benefit pension plan | Other              
Target allocation and pension plan asset allocation              
Estimated fair value of plan assets 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          
Defined benefit pension plan | Other | Level 2              
Target allocation and pension plan asset allocation              
Estimated fair value of plan assets 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          
Defined benefit pension plan | Minimum              
Weighted-average assumptions              
Discount rate used to determine obligations (as a percent)       2.75%   2.90% 3.20%
Discount rate used to determine net periodic benefit cost (as a percent) 2.90% 3.20% 2.70%        
Expected return on plan assets (as a percent)   6.75% 6.75%        
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)       3.80%   4.65% 4.80%
Discount rate used to determine net periodic benefit cost (as a percent) 4.60% 4.80% 4.40%        
Expected return on plan assets (as a percent)   7.00% 7.50%        
Supplemental executive plans and retirement agreements              
Expected future net benefit payments              
Accumulated benefit obligation       $ 90   $ 84