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Debt (Narrative) (Details) - USD ($)
3 Months Ended
Apr. 23, 2020
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Debt Instrument [Line Items]        
Repayments of Long-term Debt   $ 52,000,000 $ 63,000,000  
(Loss) gain on extinguishment of debt   (1,000,000) $ 1,000,000  
Long-term Debt   300,000,000    
Short-term borrowings   1,075,000,000   $ 700,000,000
Commercial paper   $ 1,305,000,000   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 March 31, 2020, our debt-to-capital ratio, as defined and calculated under the credit facilities, was 40.6%. We do not believe the restrictions contained in any of our credit facility covenants materially affect our financial or operating flexibility. As of March 31, 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   $ 13,000,000    
Repayments of Long-term Debt   52,000,000    
(Loss) gain on extinguishment of debt   (1,000,000)    
Lines of Credit [Member]        
Debt Instrument [Line Items]        
Maximum borrowing capacity   500,000,000    
Short-term borrowings   300,000,000   50,000,000
Federal Home Loan Bank Advances [Member]        
Debt Instrument [Line Items]        
Federal Home Loan Bank, advances, short-term   $ 775,000,000   $ 650,000,000
Debt instrument interest rate   0.679%   1.664%
Surplus Notes [Member]        
Debt Instrument [Line Items]        
Long-term Debt   $ 25,000,000   $ 25,000,000
Senior Unsecured Notes [Member]        
Debt Instrument [Line Items]        
Long-term Debt   18,842,000,000   18,815,000,000
Commercial Paper Program        
Debt Instrument [Line Items]        
Commercial paper authorized   3,500,000,000    
Commercial paper   1,305,000,000   400,000,000
364-Day Facility [Member] | Senior Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Maximum borrowing capacity   1,000,000,000    
5-Year Facility [Member] | Senior Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Long-term Debt   300,000,000   $ 0
Maximum borrowing capacity   $ 2,500,000,000    
5-Year Facility [Member] | Subsequent Event [Member] | Senior Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Repayments of Long-term Debt $ 300,000,000