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Shareholders' Equity - Adjustments to Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Class of Stock [Line Items]        
Total reclassifications into AOCI $ 3 $ (1) $ (15) $ 3
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 0 (1) (24) 2
Net realized gains from sales of available-for-sale securities, taxes     16 (1)
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) 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 (3) (1) 9 (2)
Amortization of actuarial losses, taxes $ 1 $ (1) $ (2) $ (3)