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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
Mar. 31, 2019
Mar. 31, 2018
Jan. 01, 2019
Organization Consolidation And Presentation Of Financial Statements [Line Items]      
Antidilutive securities excluded from computation of earnings per share, Amount (in shares) 9 5  
Lease liabilities $ 346    
ASU 2016-02      
Organization Consolidation And Presentation Of Financial Statements [Line Items]      
Lease liabilities     $ 229