Annual report pursuant to Section 13 and 15(d)

INVESTMENTS (Details 2)

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INVESTMENTS (Details 2) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Available-for-sale securities, by type    
Available-for-sale securities, cost $ 7,058 $ 5,952
Available-for-sale Securities, Accumulated Gross Unrealized Gain 842 514
Available-for-sale Securities, Accumulated Gross Unrealized Loss (93) (53)
Available-for-sale securities, estimated fair value 7,807 6,413
Equity securities    
Available-for-sale securities, by type    
Available-for-sale securities, cost 1,276 1,252
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain 685 425
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss (66) (22)
Available-for-sale securities, estimated fair value 1,895 1,655
Debt securities    
Available-for-sale securities, by type    
Available-for-sale securities, cost 5,782 4,700
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain 157 89
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, (27) (31)
Available-for-sale securities, estimated fair value $ 5,912 $ 4,758