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Debt (2018 Revolving Credit Facility - Narrative) (Details)
1 Months Ended 3 Months Ended
Apr. 30, 2018
USD ($)
Mar. 31, 2019
USD ($)
Apr. 04, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]        
Debt instrument   $ 2,342,000,000   $ 2,342,000,000
Subsidiary ownership   100.00%    
2018 revolving credit facility due April 2023        
Debt Instrument [Line Items]        
Amount outstanding   $ 0    
Letter of Credit        
Debt Instrument [Line Items]        
Amount outstanding   172,000,000    
Long-term debt | 2016 Credit Facility        
Debt Instrument [Line Items]        
Debt instrument $ 743,000,000      
Long-term debt | 2018 revolving credit facility due April 2023        
Debt Instrument [Line Items]        
Maximum borrowing capacity 3,500,000,000      
Current borrowing capacity   2,100,000,000    
Limit on securing indebtedness $ 2,000,000,000.0      
Percentage of consolidated net tangible assets 25.00%      
Minimum interest coverage ratio 1.00      
Amount outstanding   $ 2,000,000,000.0    
Long-term debt | 2018 revolving credit facility due April 2023 | Maximum        
Debt Instrument [Line Items]        
Leverage ratio, percentage of credit limit 10.00%      
Leverage ratio, amount of credit limit $ 150,000,000      
Long-term debt | 2018 revolving credit facility due April 2023 | Eurodollar | Minimum        
Debt Instrument [Line Items]        
Basis points 1.50%      
Long-term debt | 2018 revolving credit facility due April 2023 | Eurodollar | Maximum        
Debt Instrument [Line Items]        
Basis points 2.50%      
Long-term debt | 2018 revolving credit facility due April 2023 | Base Rate | Minimum        
Debt Instrument [Line Items]        
Basis points 0.50%      
Long-term debt | 2018 revolving credit facility due April 2023 | Base Rate | Maximum        
Debt Instrument [Line Items]        
Basis points 1.50%      
2016 Term Loan due December 2020 | Long-term debt        
Debt Instrument [Line Items]        
Debt instrument $ 1,191,000,000      
June 30, 2018 Through March 31, 2019 | Long-term debt | 2018 revolving credit facility due April 2023 | Maximum        
Debt Instrument [Line Items]        
Leverage ratio 4.50      
June 30, 2019 Through March 31, 2020 | Long-term debt | 2018 revolving credit facility due April 2023 | Maximum        
Debt Instrument [Line Items]        
Leverage ratio 4.25      
After June 30, 2020 | Long-term debt | 2018 revolving credit facility due April 2023 | Maximum        
Debt Instrument [Line Items]        
Leverage ratio 4.00      
Subsequent event | Long-term debt | 2018 revolving credit facility due April 2023        
Debt Instrument [Line Items]        
Current borrowing capacity     $ 2,100,000,000