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Basis of Presentation and Significant Accounting Policies and Practices - Additional Information (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jan. 01, 2019
Dec. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Line Items]            
Antidilutive securities excluded from computation of earnings per share, Amount (in shares) 7 5 9 5    
Long-term debt, carrying value $ 5,807   $ 5,807     $ 5,068
Lease liabilities 352   352      
ASU 2016-02            
Organization Consolidation And Presentation Of Financial Statements [Line Items]            
Lease liabilities         $ 229  
Level 2            
Organization Consolidation And Presentation Of Financial Statements [Line Items]            
Long-term debt, estimated fair value $ 6,140   $ 6,140