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Shareholders' Equity - Adjustments to Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Class of Stock [Line Items]      
Sales of non-U.S. entities, net of related taxes $ 900 $ (372) $ (735)
Total reclassifications (out of) into AOCI 2 (9)  
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 (23) 6  
Net realized gains from sales of available-for-sale securities, taxes 16 (4)  
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 24 (11)  
Amortization of actuarial losses, taxes (8) (1)  
Reclassification out of Accumulated Other Comprehensive Income | Foreign Currency Translation      
Class of Stock [Line Items]      
Sales of non-U.S. entities, net of related taxes 1 (3)  
Sale of non-U.S. entities, taxes $ 0 $ (2)