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New Accounting Standards (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
AFS Equity securities   $ 246
Equity Securities, FV-NI $ 99  
Federal rate 21.00% 35.00%
Accounting Standards Update 2016-01 [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
AFS Equity securities   $ 246
Equity Securities, FV-NI   110
Cumulative effect of adoption   1
Accounting Standards Update 2016-01 [Member] | Scenario, Adjustment [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
AFS Equity securities   136
Accounting Standards Update 2016-02 [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Cumulative effect of adoption $ 240  
Accounting Standards Update 2018-02 [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Reclassification from AOCI to retained earnings   $ 641