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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
Dec. 31, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Amount primarily related to deferred taxes on appreciation of investment value $ 240 $ 188
Cash And Cash Equivalents [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 21 24
Total Fair Value 21 [1] 24 [1]
U.S. Equity Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 331 334
Total Unrealized Gains 618 518
Total Unrealized Losses 0 (3)
Total Fair Value 949 [1] 849 [1]
Non-U.S. Equity Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 199 194
Total Unrealized Gains 181 131
Total Unrealized Losses (1) (2)
Total Fair Value 379 [1] 323 [1]
U.S. Government And Agency Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 723 774
Total Unrealized Gains 97 102
Total Unrealized Losses 0 0
Total Fair Value 820 [1] 876 [1]
Municipal Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 56 56
Total Unrealized Gains 4 2
Total Unrealized Losses (1) 0
Total Fair Value 59 [1] 58 [1]
Other Fixed-Income Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 168 96
Total Unrealized Gains 5 3
Total Unrealized Losses 0 0
Total Fair Value 173 [1] 99 [1]
Securities (Assets) [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,498 1,478
Total Unrealized Gains 905 756
Total Unrealized Losses (2) (5)
Total Fair Value $ 2,401 [1] $ 2,229 [1]
[1] Excludes $240 million and $188 million at December 31, 2012 and December 31, 2011, respectively, primarily related to deferred taxes on appreciation of investment value.