Annual report pursuant to Section 13 and 15(d)

INVESTMENTS (Details 2)

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INVESTMENTS (Details 2) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Available-for-sale securities, by type    
Available-for-sale securities, cost $ 4,126 $ 1,166
Available-for-sale Securities, Gross Unrealized Gains 487 238
Available-for-sale Securities, Gross Unrealized Losses (20) (3)
Available-for-sale securities, estimated fair value, total 4,593 1,401
Equity securities
   
Available-for-sale securities, by type    
Available-for-sale securities, cost 957 834
Available-for-sale Securities, Gross Unrealized Gains 441 237
Available-for-sale Securities, Gross Unrealized Losses (10) 0
Available-for-sale securities, estimated fair value, total 1,388 1,071
Debt securities
   
Available-for-sale securities, by type    
Available-for-sale securities, cost 3,169 332
Available-for-sale Securities, Gross Unrealized Gains 46 1
Available-for-sale Securities, Gross Unrealized Losses (10) (3)
Available-for-sale securities, estimated fair value, total $ 3,205 $ 330