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Fair Value Measurements (Schedule Of Unrealized Gains (Losses) Related To Available-For-Sale Investments) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 1,516 $ 1,478
Total Unrealized Gains 870 756
Total Unrealized Losses (4) (5)
Total Fair Value 2,382 [1] 2,229 [1]
Amount primarily related to deferred taxes on appreciation of investment value 248 188
U.S. Equity Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 319 334
Total Unrealized Gains 616 518
Total Unrealized Losses (1) (3)
Total Fair Value 934 [1] 849 [1]
Non-U.S. Equity Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 197 194
Total Unrealized Gains 162 131
Total Unrealized Losses (1) (2)
Total Fair Value 358 [1] 323 [1]
U.S. Government And Agency Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 787 798
Total Unrealized Gains 86 102
Total Unrealized Losses (1)  
Total Fair Value 872 [1] 900 [1]
Municipal Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 66 56
Total Unrealized Gains 3 2
Total Unrealized Losses (1)  
Total Fair Value 68 [1] 58 [1]
Other Fixed-Income Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 147 96
Total Unrealized Gains 3 3
Total Unrealized Losses     
Total Fair Value $ 150 [1] $ 99 [1]
[1] Excludes $248 million and $188 million at March 31, 2012 and December 31, 2011, respectively, primarily related to deferred taxes on appreciation of investment value.