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Nature of Business and Basis of Presentation - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Right-of-use assets $ 121 $ 114 $ 0
Lease liabilities $ 135 $ 124 $ 0