STOCKHOLDERS' EQUITY - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands					1 Months Ended	4 Months Ended	6 Months Ended	12 Months Ended
	Dec. 22, 2017	Nov. 02, 2017	Aug. 28, 2017	Feb. 22, 2017	Mar. 31, 2015	Dec. 31, 2017	Aug. 28, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Feb. 16, 2018	Dec. 21, 2017	Dec. 14, 2017	Feb. 16, 2017	Feb. 14, 2017	Sep. 30, 2014	Jun. 30, 2014
Equity, Class of Treasury Stock [Line Items]
Total amount								$ 216,000,000	$ 172,000,000	$ 170,000,000
Share repurchase authorization													$ 3,000,000,000.0		$ 2,250,000,000.00	$ 2,000,000,000	$ 1,000,000,000
Remaining authorized amount																$ 816,000,000
Value of shares repurchased								$ 3,365,000,000	$ 104,000,000	$ 385,000,000
Common shares acquired in connection with employee stock plans (in shares)								500	600	300
Common shares acquired in connection with employee stock plans, amount								$ 115,000,000	$ 104,000,000	$ 56,000,000
Aggregate statutory capital and surplus in our state regulated insurance subsidiaries						$ 8,000,000,000		8,000,000,000	7,700,000,000
Aggregate minimum regulatory requirements of statutory capital and surplus						4,800,000,000		4,800,000,000	$ 4,800,000,000
Dividends that may be paid to the parent company without prior approval by state regulatory authorities in 2014						$ 1,100,000,000		1,100,000,000
Dividends that were paid to the parent company without prior approval by state regulatory authorities								1,400,000,000
Dividend Declared
Equity, Class of Treasury Stock [Line Items]
Cash dividend declared (in dollars per share)		$ 0.40
Total amount		$ 55,000,000
February 2017 ASR
Equity, Class of Treasury Stock [Line Items]
Share repurchase authorization														$ 1,500,000,000.0
Share repurchase payment				$ 1,500,000,000
Shares repurchased in open market (in shares)			840	5,830		3,040	6,670
Value of shares repurchased			$ 300,000,000	$ 1,200,000,000		$ 750,000,000
Decrease in capital in excess of par value				$ 300,000,000
Average cost per share (in dollars per share)							$ 224.81
ASR, settlement receipt (in shares)					360
December 2017 ASR
Equity, Class of Treasury Stock [Line Items]
Share repurchase authorization												$ 1,000,000,000.0
Share repurchase payment	$ 1,000,000,000
Shares repurchased in open market (in shares)	3,280
Value of shares repurchased	$ 800,000,000
Decrease in capital in excess of par value	$ 200,000,000
September 2014 Authorization
Equity, Class of Treasury Stock [Line Items]
Share repurchase authorization						2,000,000,000		$ 2,000,000,000
Shares repurchased in open market (in shares)								0	0	1,850
Value of shares repurchased								$ 0	$ 0	$ 329,000,000
February 2017 Authorization
Equity, Class of Treasury Stock [Line Items]
Share repurchase authorization						2,250,000,000		$ 2,250,000,000
Shares repurchased in open market (in shares)								9,710	0	0
Value of shares repurchased								$ 2,250,000,000	$ 0	$ 0
December 2017 Authorization
Equity, Class of Treasury Stock [Line Items]
Share repurchase authorization						$ 3,000,000,000		$ 3,000,000,000
Shares repurchased in open market (in shares)								3,280	0	0
Value of shares repurchased								$ 800,000,000	$ 0	$ 0
Excluding Employee Stock Plans and ASR
Equity, Class of Treasury Stock [Line Items]
Shares repurchased in open market (in shares)								12,990	0	1,850
Value of shares repurchased								$ 3,050,000,000	$ 0	$ 329,000,000
Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Remaining authorized amount											$ 2,000,000,000