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Description of Company And Significant Accounting Policies (Narrative) (Details)
3 Months Ended
Jan. 01, 2019
USD ($)
Mar. 31, 2019
USD ($)
segment
Dec. 31, 2018
USD ($)
Jan. 01, 2018
USD ($)
Accounting Policies [Abstract]        
Number of reportable segments | segment   5    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Amount reclassified from cost of revenues to selling, general and administrative expense $ 34,000,000      
Operating lease right-of-use asset 185,000,000 $ 180,000,000 $ 0  
Operating lease, liability   247,000,000    
Equity in and advances to unconsolidated affiliates   810,000,000 744,000,000  
Cumulative effect of change in accounting policy 21,000,000     $ 144,000,000
Deferred rent   $ 92,000,000    
Accounting Standards Update 2016-02        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Operating lease right-of-use asset     $ 185,000,000  
Operating lease, liability 253,000,000      
Deferred rent (68,000,000)      
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Equity in and advances to unconsolidated affiliates       87,000,000
Retained Earnings        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Cumulative effect of change in accounting policy 21,000,000     $ 144,000,000
Retained Earnings | Accounting Standards Update 2016-02        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Cumulative effect of change in accounting policy 21,000,000      
Unamortized deferred gain $ 7,000,000