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Debt (tables)
 12 Months Ended
Dec. 31, 2017
Debt disclosure  
Debt outstanding [Table Text Block]

(at December 31, in millions)
  2017   2016  

Short-term:

              

Commercial paper

   $ 100   $ 100  

5.80% Senior notes due May 15, 2018

     500     —  

5.75% Senior notes due December 15, 2017

     —     450  
​ ​ ​ ​ ​ ​ ​ ​

Total short-term debt

     600     550  
​ ​ ​ ​ ​ ​ ​ ​

Long-term:

              

5.80% Senior notes due May 15, 2018

     —     500  

5.90% Senior notes due June 2, 2019

     500     500  

3.90% Senior notes due November 1, 2020

     500     500  

7.75% Senior notes due April 15, 2026

     200     200  

7.625% Junior subordinated debentures due December 15, 2027

     125     125  

6.375% Senior notes due March 15, 2033

     500     500  

6.75% Senior notes due June 20, 2036

     400     400  

6.25% Senior notes due June 15, 2037

     800     800  

5.35% Senior notes due November 1, 2040

     750     750  

4.60% Senior notes due August 1, 2043

     500     500  

4.30% Senior notes due August 25, 2045

     400     400  

8.50% Junior subordinated debentures due December 15, 2045

     56     56  

3.75% Senior notes due May 15, 2046

     500     500  

8.312% Junior subordinated debentures due July 1, 2046

     73     73  

4.00% Senior notes due May 30, 2047

     700     —  

6.25% Fixed-to-floating rate junior subordinated debentures due March 15, 2067

     —     107  
​ ​ ​ ​ ​ ​ ​ ​

Total long-term debt

     6,004     5,911  
​ ​ ​ ​ ​ ​ ​ ​

Total debt principal

     6,604     6,461  

Unamortized fair value adjustment

     46     47  

Unamortized debt issuance costs

     (79 )   (71 )
​ ​ ​ ​ ​ ​ ​ ​

Total debt

   $ 6,571   $ 6,437  
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
Merger-related unamortized fair value adjustments and the related effective interest rate [Table Text Block]

 
    
    
   Unamortized
Fair Value
Purchase
Adjustment at
December 31,		    
  
 
    
    
   Effective
Interest Rate
to Maturity		  
(in millions)
  Issue Rate   Maturity Date   2017   2016  

Junior subordinated debentures

     7.625 %   Dec. 2027   $ 13   $ 14     6.147 %

    8.500 %   Dec. 2045     15     15     6.362 %

    8.312 %   Jul. 2046     18     18     6.362 %
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

               $ 46   $ 47        
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​