XML 47 R35.htm IDEA: XBRL DOCUMENT v3.10.0.1
New Accounting Standards (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
AFS Equity securities         $ 246
Equity Securities, FV-NI $ 112   $ 112    
Federal rate 21.00% 35.00% 21.00% 35.00% 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 2018-02 [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Reclassification from AOCI to retained earnings         $ 641