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Investments, Investment Income and Gains and Losses - Derivative Financial Instruments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Derivative [Line Items]    
Derivative contract term 3 months  
Fair Value
Net liability position of derivatives that contain certain credit risk-related contingent features
Gain (Loss) Recognized in Income Statement
Gain (Loss) Recognized in Other Comprehensive Income
Gains (losses) reclassified from other comprehensive income into shareholders' net income
Amounts excluded from assessment of hedge effectiveness
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Foreign Currency Swaps [Member]    
Derivative [Line Items]    
Notional amount   525
Notional amount, including disposal groups 817  
Designated as Hedging Instrument [Member] | Net Investment Hedge [Member] | Foreign Currency Swaps [Member]    
Derivative [Line Items]    
Notional amount   439
Notional amount, including disposal groups 844  
Non designated [Member] | Forward Contracts [Member]    
Derivative [Line Items]    
Notional amount   $ 309
Notional amount, including disposal groups $ 410