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General (Adoption of Updated Guidance) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Property and equipment at cost (less accumulated depreciation) $ 314 $ 326 $ 324
Other Assets 1,579 1,445 1,208
Other liabilities 3,533 3,328 $ 3,089
Adjustments Due to Adoption of Topic 842      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Property and equipment at cost (less accumulated depreciation)   2  
Other Assets $ (75) 237  
Other liabilities   $ 239