SUBSEQUENT EVENTS (Details) - USD ($)															12 Months Ended
	Feb. 14, 2017	Jan. 20, 2017	Dec. 22, 2016	Sep. 29, 2016	Jun. 27, 2016	Mar. 28, 2016	Dec. 21, 2015	Sep. 28, 2015	Jun. 25, 2015	Mar. 26, 2015	Dec. 18, 2014	Sep. 25, 2014	Jun. 24, 2014	Mar. 25, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Nov. 02, 2016
Subsequent Event [Line Items]
Dividends declared per common share															$ 1.28	$ 0.81	$ 0.5
Authorized amount of common Stock share repurchase																		$ 3,000,000,000
Aggregate remaining authorization amount of common Stock share repurchase															$ 2,500,000,000			$ 4,400,000,000
Date of Shareholders of Record			Dec. 08, 2016	Sep. 15, 2016	Jun. 13, 2016	Mar. 14, 2016	Dec. 07, 2015	Sep. 14, 2015	Jun. 11, 2015	Mar. 12, 2015	Dec. 04, 2014	Sep. 11, 2014	Jun. 10, 2014	Mar. 11, 2014
Subsequent event
Subsequent Event [Line Items]
Dividends declared per common share	$ 0.32
Authorized amount of common Stock share repurchase	$ 3,500,000,000
Aggregate remaining authorization amount of common Stock share repurchase	$ 4,700,000,000
Date Dividends Declared															Feb. 14, 2017
Date Dividends To Be Paid															Mar. 29, 2017
Date of Shareholders of Record															Mar. 15, 2017
Subsequent event | NICO [Member]
Subsequent Event [Line Items]
Reinsurance Ceded, Percent		80.00%
Reinsurance ceded attachment point		$ 25,000,000,000
Reinsurance limit above attachment point		25,000,000,000
Reinsurance Recoverables Aggregate Limit		20,000,000,000
Consideration paid		$ 9,800,000,000
Interest rate, percent		4.00%