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Shareholders' Equity - Adjustments to Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Class of Stock [Line Items]        
Total reclassifications (out of) into AOCI $ 6 $ 1 $ (13) $ 4
Reclassification out of Accumulated Other Comprehensive Income | Net Unrealized Gains (Losses) on Available-for-Sale Securities        
Class of Stock [Line Items]        
Net realized gains (losses) from sales of available-for-sale securities, net of related taxes 4 2 (23) 4
Net realized gains from sales of available-for-sale securities, taxes (1) (2) 15 (3)
Reclassification out of Accumulated Other Comprehensive Income | Other-Than-Temporary Impairment on Securities        
Class of Stock [Line Items]        
Other-than-temporary impairment on held-to-maturity securities related to factors other than credit     0 (1)
Other-than-temporary impairment on held-to-maturity securities related to factors other than credit, taxes     0 1
Reclassification out of Accumulated Other Comprehensive Income | Amortization of Actuarial Losses        
Class of Stock [Line Items]        
Amortization of actuarial losses, net of related taxes 2 (1) 10 1
Amortization of actuarial losses, taxes $ 0 $ 1 $ (2) $ (2)