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Investments (Distribution Of Securities By Percentage Of Fair Value Below Book Value By More Than 5%) (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Available For Sale Securities [Abstract]    
Fixed-maturity securities held as available-for-sale, amortized cost $ 6,783 $ 6,824
Available For Sale Securities 6,860 6,692
Held To Maturity Securities [Abstract]    
Held-To-Maturity Securities Amortized Cost 2,787 2,801
Held-To-Maturity Securities Fair Value 2,780 2,651
> 5% To 15% [Member]
    
Held To Maturity Securities [Abstract]    
Percentage Of Fair Value Below Book Value Minimum 5.00%  
Percentage Of Fair Value Below Book Value Maximum 15.00%  
> 5% To 15% [Member] | Unrealized loss position > 12 months
    
Available For Sale Securities [Abstract]    
Number of available-for-sale securities in unrealized loss position 26  
Fixed-maturity securities held as available-for-sale, amortized cost 220  
Available For Sale Securities 206  
Held To Maturity Securities [Abstract]    
Number of Held-To-Maturity Securities in unrealized loss position 0  
Held-To-Maturity Securities Amortized Cost 0  
Held-To-Maturity Securities Fair Value 0  
> 15% To 25% [Member]
    
Held To Maturity Securities [Abstract]    
Percentage Of Fair Value Below Book Value Minimum 15.00%  
Percentage Of Fair Value Below Book Value Maximum 25.00%  
> 15% To 25% [Member] | Unrealized loss position > 12 months
    
Available For Sale Securities [Abstract]    
Number of available-for-sale securities in unrealized loss position 7  
Fixed-maturity securities held as available-for-sale, amortized cost 90  
Available For Sale Securities 73  
Held To Maturity Securities [Abstract]    
Number of Held-To-Maturity Securities in unrealized loss position 1  
Held-To-Maturity Securities Amortized Cost 575  
Held-To-Maturity Securities Fair Value 445  
> 25% To 50% [Member]
    
Held To Maturity Securities [Abstract]    
Percentage Of Fair Value Below Book Value Minimum 25.00%  
Percentage Of Fair Value Below Book Value Maximum 50.00%  
> 25% To 50% [Member] | Unrealized loss position > 12 months
    
Available For Sale Securities [Abstract]    
Number of available-for-sale securities in unrealized loss position 0  
Fixed-maturity securities held as available-for-sale, amortized cost 0  
Available For Sale Securities 0  
Held To Maturity Securities [Abstract]    
Number of Held-To-Maturity Securities in unrealized loss position 0  
Held-To-Maturity Securities Amortized Cost 0  
Held-To-Maturity Securities Fair Value 0  
> 50% [Member]
    
Held To Maturity Securities [Abstract]    
Percentage Of Fair Value Below Book Value Minimum 50.00%  
> 50% [Member] | Unrealized loss position > 12 months
    
Available For Sale Securities [Abstract]    
Number of available-for-sale securities in unrealized loss position 3  
Fixed-maturity securities held as available-for-sale, amortized cost 20  
Available For Sale Securities 3  
Held To Maturity Securities [Abstract]    
Number of Held-To-Maturity Securities in unrealized loss position 0  
Held-To-Maturity Securities Amortized Cost 0  
Held-To-Maturity Securities Fair Value 0  
Greater Than 5% [Member] | Unrealized loss position > 12 months
    
Available For Sale Securities [Abstract]    
Number of available-for-sale securities in unrealized loss position 36  
Fixed-maturity securities held as available-for-sale, amortized cost 330  
Available For Sale Securities 282  
Held To Maturity Securities [Abstract]    
Number of Held-To-Maturity Securities in unrealized loss position 1  
Held-To-Maturity Securities Amortized Cost 575  
Held-To-Maturity Securities Fair Value $ 445