SEGMENT INFORMATION (Details - Consolidated operations and long-lived assets by major geographic area) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	$ 12,635	$ 11,751	$ 12,502	$ 12,632	$ 13,010	$ 12,854	$ 14,724	$ 11,779	$ 49,520	$ 52,367	$ 58,327
Real Estate and Other Fixed Assets, Net of Accumulated Depreciation	2,522				2,660				2,522	2,660	3,135
North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues									34,149	36,871	41,680
Real Estate and Other Fixed Assets, Net of Accumulated Depreciation	1,630				1,326				1,630	1,326	1,819
International
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues									15,371	15,496	16,647
Real Estate and Other Fixed Assets, Net of Accumulated Depreciation	$ 892				$ 1,334				$ 892	$ 1,334	$ 1,316