XML 64 R65.htm IDEA: XBRL DOCUMENT v2.4.0.6
Investments (Distribution Of Held To Maturity Investments By Contractual Maturity) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Variable Interest Entity [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Total held-to-maturity investments, Amortized Cost $ 3,093 $ 3,843
Total held-to-maturity investments, Fair Value 2,871 3,489
Held-To-Maturity [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Due in one year or less, Amortized Cost     
Due in one year or less, Fair Value     
Due after one year through five years, Amortized Cost 1 [1]  
Due after one year through five years, Fair Value 1 [1]  
Due after five years through ten years, Amortized Cost     
Due after five years through ten years, Fair Value     
Due after ten years through fifteen years, Amortized Cost     
Due after ten years through fifteen years, Fair Value     
Due after fifteen years, Amortized Cost     
Due after fifteen years, Fair Value     
Total held-to-maturity investments, Amortized Cost 1  
Total held-to-maturity investments, Fair Value 1  
Held-To-Maturity [Member] | Mortgage-Backed Securities [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Total held-to-maturity investments, Amortized Cost     
Total held-to-maturity investments, Fair Value     
Held-To-Maturity [Member] | Variable Interest Entity [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Due in one year or less, Amortized Cost     
Due in one year or less, Fair Value     
Due after five years through ten years, Amortized Cost     
Due after five years through ten years, Fair Value     
Due after ten years through fifteen years, Amortized Cost     
Due after ten years through fifteen years, Fair Value     
Due after fifteen years, Amortized Cost     
Due after fifteen years, Fair Value     
Total held-to-maturity investments, Amortized Cost 3,093  
Total held-to-maturity investments, Fair Value 2,871  
Held-To-Maturity [Member] | Variable Interest Entity [Member] | Mortgage-Backed Securities [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Total held-to-maturity investments, Amortized Cost     
Total held-to-maturity investments, Fair Value     
Held-To-Maturity [Member] | Variable Interest Entity [Member] | Asset-Backed Securities [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Total held-to-maturity investments, Amortized Cost 3,093  
Total held-to-maturity investments, Fair Value $ 2,871  
[1] Relates to tax credit investments reported in "Other investments" on the Company's consolidated balance sheets.