FAIR VALUE MEASUREMENTS (Details 12) (Fair value on a non-recurring basis, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
FAIR VALUE, ASSETS MEASUREMENTS ON A NON-RECURRING BASIS
Impairment Charges	$ 471	$ 2,353	$ 2,546
Investment real estate:
FAIR VALUE, ASSETS MEASUREMENTS ON A NON-RECURRING BASIS
Impairment Charges		18	604
Other investments
FAIR VALUE, ASSETS MEASUREMENTS ON A NON-RECURRING BASIS
Impairment Charges	460	639	323
Aircraft
FAIR VALUE, ASSETS MEASUREMENTS ON A NON-RECURRING BASIS
Impairment Charges		1,693	1,614
Other assets
FAIR VALUE, ASSETS MEASUREMENTS ON A NON-RECURRING BASIS
Impairment Charges	11	3	5
Level 3
FAIR VALUE, ASSETS MEASUREMENTS ON A NON-RECURRING BASIS
Assets at Fair Value, Non-Recurring Basis	2,080	4,343
Level 3 | Investment real estate:
FAIR VALUE, ASSETS MEASUREMENTS ON A NON-RECURRING BASIS
Assets at Fair Value, Non-Recurring Basis		457
Level 3 | Other investments
FAIR VALUE, ASSETS MEASUREMENTS ON A NON-RECURRING BASIS
Assets at Fair Value, Non-Recurring Basis	2,062	2,199
Level 3 | Aircraft
FAIR VALUE, ASSETS MEASUREMENTS ON A NON-RECURRING BASIS
Assets at Fair Value, Non-Recurring Basis		1,683
Level 3 | Other assets
FAIR VALUE, ASSETS MEASUREMENTS ON A NON-RECURRING BASIS
Assets at Fair Value, Non-Recurring Basis	18	4
Total Fair Value
FAIR VALUE, ASSETS MEASUREMENTS ON A NON-RECURRING BASIS
Assets at Fair Value, Non-Recurring Basis	2,083	4,343
Total Fair Value | Investment real estate:
FAIR VALUE, ASSETS MEASUREMENTS ON A NON-RECURRING BASIS
Assets at Fair Value, Non-Recurring Basis		457
Total Fair Value | Other investments
FAIR VALUE, ASSETS MEASUREMENTS ON A NON-RECURRING BASIS
Assets at Fair Value, Non-Recurring Basis	2,062	2,199
Total Fair Value | Aircraft
FAIR VALUE, ASSETS MEASUREMENTS ON A NON-RECURRING BASIS
Assets at Fair Value, Non-Recurring Basis		1,683
Total Fair Value | Other assets
FAIR VALUE, ASSETS MEASUREMENTS ON A NON-RECURRING BASIS
Assets at Fair Value, Non-Recurring Basis	21	4
Level 2
FAIR VALUE, ASSETS MEASUREMENTS ON A NON-RECURRING BASIS
Assets at Fair Value, Non-Recurring Basis	3
Level 2 | Other assets
FAIR VALUE, ASSETS MEASUREMENTS ON A NON-RECURRING BASIS
Assets at Fair Value, Non-Recurring Basis	$ 3