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Summary of Significant Accounting Policies - Other (Details) - USD ($)
$ in Millions
3 Months Ended
Jan. 01, 2018
Sep. 30, 2018
ASU 2016-01 | Accumulated Other Comprehensive Loss    
Recently Adopted Accounting Standards    
Adoption of ASU 2016-01 $ (2)  
ASU 2016-01 | Retained Earnings    
Recently Adopted Accounting Standards    
Adoption of ASU 2016-01 $ 2  
ASU 2018-02 | Accumulated Other Comprehensive Loss    
Recently Adopted Accounting Standards    
Adoption of ASU 2018-02   $ (5)
ASU 2018-02 | Retained Earnings    
Recently Adopted Accounting Standards    
Adoption of ASU 2018-02   $ 5