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Debt (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
May 05, 2020
Dec. 31, 2019
Sep. 09, 2019
Debt Instrument [Line Items]              
Repayments of Long-term Debt     $ 155,000,000 $ 73,000,000      
(Loss) gain on extinguishment of debt $ (3,000,000) $ 0 (4,000,000) $ 1,000,000      
Short-term borrowings 0   $ 0     $ 700,000,000  
Commercial paper           400,000,000  
Senior Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Covenant description     Our ability to borrow under these credit facilities is subject to compliance with certain covenants, including covenants requiring us to maintain a defined debt-to-capital ratio of not more than 60%, subject to increase in certain circumstances set forth in the applicable credit agreement.        
Covenant compliance     As of June 30, 2020, we were in compliance with all of the debt covenants under these credit facilities.        
Convertible Debt [Member]              
Debt Instrument [Line Items]              
Repurchased Face Amount 27,000,000   $ 40,000,000        
Repayments of Long-term Debt 103,000,000   155,000,000        
(Loss) gain on extinguishment of debt (3,000,000)   (4,000,000)        
Lines of Credit [Member]              
Debt Instrument [Line Items]              
Maximum borrowing capacity 400,000,000   400,000,000        
Short-term borrowings 0   0     50,000,000  
Federal Home Loan Bank Advances [Member]              
Debt Instrument [Line Items]              
Federal Home Loan Bank, advances, short-term 0   0     $ 650,000,000  
Debt instrument interest rate           1.664%  
Surplus Notes [Member]              
Debt Instrument [Line Items]              
Long-term Debt 25,000,000   25,000,000     $ 25,000,000  
Senior Unsecured Notes [Member]              
Debt Instrument [Line Items]              
Long-term Debt 21,333,000,000   21,333,000,000     18,815,000,000  
Senior Unsecured Notes [Member] | Two Point Three Seven Five Due Two Thousand Twenty Five [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount         $ 400,000,000   $ 850,000,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate         2.375%   2.375%
Senior Unsecured Notes [Member] | Two Point Two Five Zero Due Two Thousand Thirty [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount         $ 1,100,000,000    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate         2.25%    
Senior Unsecured Notes [Member] | Three Point One Two Five Due Two Thousand Fifty [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount         $ 1,000,000,000    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate         3.125%    
Commercial Paper Program              
Debt Instrument [Line Items]              
Commercial paper authorized 3,500,000,000   3,500,000,000        
Commercial paper 0   0     400,000,000  
364-Day Facility [Member] | Senior Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Maximum borrowing capacity 1,000,000,000   1,000,000,000        
5-Year Facility [Member] | Senior Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Long-term Debt 0   0     $ 0  
Maximum borrowing capacity $ 2,500,000,000   $ 2,500,000,000