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Debt (2018 Revolving Credit Facility - Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 26, 2018
Apr. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Debt Instrument [Line Items]              
Debt instrument     $ 2,292,000,000   $ 2,292,000,000   $ 2,342,000,000
(Gain) loss on early extinguishment of debt     (7,000,000) $ 0 (7,000,000) $ 8,000,000  
Unamortized issuance expense     20,000,000   $ 20,000,000   $ 23,000,000
Subsidiary ownership         100.00%    
Letter of Credit              
Debt Instrument [Line Items]              
Current aggregate commitment     172,000,000   $ 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 aggregate commitment     2,000,000,000.0   2,000,000,000.0    
Limit on securing indebtedness     $ 2,000,000,000.0   $ 2,000,000,000.0    
Percentage of consolidated net tangible assets   25.00%          
Minimum interest coverage ratio   1.00          
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          
Secured term loan | Long-term debt              
Debt Instrument [Line Items]              
Debt instrument $ 743,000,000            
Extinguishment of debt 1,191,000,000            
(Gain) loss on early extinguishment of debt 8,000,000            
Unamortized issuance expense $ 4,000,000            
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