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Shareholders' Equity - Adjustments to Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Class of Stock [Line Items]        
Sales of non-U.S. entities, net of related taxes $ (57) $ 259 $ (244) $ 785
Total reclassifications into AOCI 0 6 17 (13)
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 4 6 (23)
Net realized gains from sales of available-for-sale securities, taxes 0 (1) (2) 15
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 1 0 (3) 0
Other-than-temporary impairment on held-to-maturity securities related to factors other than credit, taxes     1 0
Reclassification out of Accumulated Other Comprehensive Income | Amortization of Actuarial Losses        
Class of Stock [Line Items]        
Amortization of actuarial losses, net of related taxes (1) (2) 14 10
Amortization of actuarial losses, taxes $ (1) $ 0 $ (5) $ (2)