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Shareholders' Equity - Adjustments to Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Class of Stock [Line Items]    
Sales of non-U.S. entities, net of related taxes $ 151 $ 91
Total reclassifications (out of) into AOCI (15) (18)
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 (1) (24)
Net realized gains from sales of available-for-sale securities, taxes (1) 16
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
Reclassification out of Accumulated Other Comprehensive Income | Amortization of Actuarial Losses    
Class of Stock [Line Items]    
Amortization of actuarial losses, net of related taxes (13) 6
Amortization of actuarial losses, taxes $ (28) $ (3)