INVESTMENTS - Cumulative OTTI Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
AFS debt securities
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward
Beginning balance	$ 718	$ 726	$ 732	$ 733
Credit impairments recognized in earnings on securities not previously impaired	0	1	2	1
Credit impairments recognized in earnings on securities that have been previously impaired	0	0	2	0
Reductions due to credit-impaired securities sold, transferred or matured	(26)	0	(44)	(7)
Ending balance	692	727	692	727
AFS debt securities | Mortgage-backed securities
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward
Beginning balance	294	295	294	295
Credit impairments recognized in earnings on securities not previously impaired	0	0	1	0
Credit impairments recognized in earnings on securities that have been previously impaired	0	0	0	0
Reductions due to credit-impaired securities sold, transferred or matured	0	0	(1)	0
Ending balance	294	295	294	295
AFS debt securities | State and municipal securities
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward
Beginning balance	0	0	8	0
Credit impairments recognized in earnings on securities not previously impaired	0	0	0	0
Credit impairments recognized in earnings on securities that have been previously impaired	0	0	0	0
Reductions due to credit-impaired securities sold, transferred or matured	0	0	(8)	0
Ending balance	0	0	0	0
AFS debt securities | Foreign government securities
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward
Beginning balance	170	170	170	171
Credit impairments recognized in earnings on securities not previously impaired	0	0	0	0
Credit impairments recognized in earnings on securities that have been previously impaired	0	0	0	0
Reductions due to credit-impaired securities sold, transferred or matured	(5)	0	(5)	(1)
Ending balance	165	170	165	170
AFS debt securities | Corporate
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward
Beginning balance	110	112	112	118
Credit impairments recognized in earnings on securities not previously impaired	0	1	1	1
Credit impairments recognized in earnings on securities that have been previously impaired	0	0	2	0
Reductions due to credit-impaired securities sold, transferred or matured	(1)	0	(6)	(6)
Ending balance	109	113	109	113
AFS debt securities | Other
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward
Beginning balance	144	149	148	149
Credit impairments recognized in earnings on securities not previously impaired	0	0	0	0
Credit impairments recognized in earnings on securities that have been previously impaired	0	0	0	0
Reductions due to credit-impaired securities sold, transferred or matured	(20)	0	(24)	0
Ending balance	124	149	124	149
HTM debt securities
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward
Beginning balance	664	783	688	803
Credit impairments recognized in earnings on securities not previously impaired	0	0	1	0
Credit impairments recognized in earnings on securities that have been previously impaired	0	0	0	0
Reductions due to credit-impaired securities sold, transferred or matured	(2)	(31)	(27)	(51)
Ending balance	662	752	662	752
HTM debt securities | Mortgage-backed securities
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward
Beginning balance	532	650	556	670
Credit impairments recognized in earnings on securities not previously impaired	0	0	0	0
Credit impairments recognized in earnings on securities that have been previously impaired	0	0	0	0
Reductions due to credit-impaired securities sold, transferred or matured	(2)	(30)	(26)	(50)
Ending balance	530	620	530	620
HTM debt securities | State and municipal securities
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward
Beginning balance	1		0
Credit impairments recognized in earnings on securities not previously impaired	0		1
Credit impairments recognized in earnings on securities that have been previously impaired	0		0
Reductions due to credit-impaired securities sold, transferred or matured	0		0
Ending balance	1		1
HTM debt securities | Other
Schedule of other-than-temporary impairment, credit losses recognized in earnings, roll forward
Beginning balance	131	133	132	133
Credit impairments recognized in earnings on securities not previously impaired	0	0	0	0
Credit impairments recognized in earnings on securities that have been previously impaired	0	0	0	0
Reductions due to credit-impaired securities sold, transferred or matured	0	(1)	(1)	(1)
Ending balance	$ 131	$ 132	$ 131	$ 132