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FAIR VALUE MEASUREMENTS (Details 5) (Fair value on a non-recurring basis, USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2011
Investment real estate:
Jun. 30, 2011
Investment real estate:
Jun. 30, 2012
Other investments
Jun. 30, 2011
Other investments
Jun. 30, 2012
Other investments
Jun. 30, 2011
Other investments
Jun. 30, 2012
Aircraft
Jun. 30, 2011
Aircraft
Jun. 30, 2012
Aircraft
Jun. 30, 2011
Aircraft
Jun. 30, 2012
Other assets
Jun. 30, 2012
Level 3
Dec. 31, 2011
Level 3
Jun. 30, 2012
Level 3
Investment real estate:
Dec. 31, 2011
Level 3
Investment real estate:
Jun. 30, 2012
Level 3
Other investments
Dec. 31, 2011
Level 3
Other investments
Jun. 30, 2012
Level 3
Aircraft
Dec. 31, 2011
Level 3
Aircraft
Jun. 30, 2012
Level 3
Other assets
Dec. 31, 2011
Level 3
Other assets
Jun. 30, 2012
Total Fair Value
Dec. 31, 2011
Total Fair Value
Jun. 30, 2012
Total Fair Value
Investment real estate:
Dec. 31, 2011
Total Fair Value
Investment real estate:
Jun. 30, 2012
Total Fair Value
Other investments
Dec. 31, 2011
Total Fair Value
Other investments
Jun. 30, 2012
Total Fair Value
Aircraft
Dec. 31, 2011
Total Fair Value
Aircraft
Jun. 30, 2012
Total Fair Value
Other assets
Dec. 31, 2011
Total Fair Value
Other assets
FAIR VALUE, ASSETS MEASUREMENTS ON A NON-RECURRING BASIS                                                                      
Assets at Fair Value, Non-Recurring Basis                               $ 2,092 $ 4,343 $ 331 $ 457 $ 1,582 $ 2,199 $ 161 $ 1,683 $ 18 $ 4 $ 2,092 $ 4,343 $ 331 $ 457 $ 1,582 $ 2,199 $ 161 $ 1,683 $ 18 $ 4
Impairment Charges $ 158 $ 286 $ 313 $ 518 $ 3 $ 15 $ 83 $ 239 $ 176 $ 345 $ 75 $ 44 $ 129 $ 158 $ 8