Consolidated Investment Entities - Consolidation of Investment Entities into the Consolidated Balance Sheets (Details) $ in Millions	Dec. 31, 2019 USD ($) fund	Dec. 31, 2018 USD ($) fund
Condensed Financial Statements, Captions [Line Items]
Consolidated funds | fund	12	12
Variable Interest Entity, Consolidated, Carrying Amount, Assets [Abstract]
Assets of consolidated investment entities	$ 2,226	$ 2,310
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities [Abstract]
Liabilities of consolidated investment entities	1,126	1,228
Assets:
Total investments and cash	54,868	51,852
Other assets	10,218	11,292
Assets held in consolidated investment entities	2,226	2,310
Assets held in separate accounts	81,670	69,931
Assets held for sale	20,069	20,045
Total assets	169,051	155,430
Liabilities and Shareholders' Equity:
Future policy benefits and contract owner account balances	50,868	50,770
Other liabilities	6,659	6,593
Liabilities held in consolidated investment entities	1,126	1,228
Liabilities related to separate accounts	81,670	69,931
Liabilities held for sale	18,498	17,903
Total liabilities	158,821	146,425
Equity attributable to common shareholders	9,408	8,213
Appropriated-consolidated investment entities	0	0
Noncontrolling interest	822	792
Total liabilities and shareholder's equity	169,051	155,430
Before Consolidation
Assets:
Total investments and cash	55,146	52,142
Other assets	10,219	11,293
Assets held in consolidated investment entities	0	0
Assets held in separate accounts	81,670	69,931
Assets held for sale	20,069	20,045
Total assets	167,104	153,411
Liabilities and Shareholders' Equity:
Future policy benefits and contract owner account balances	50,868	50,770
Other liabilities	6,659	6,593
Liabilities held in consolidated investment entities	1	1
Liabilities related to separate accounts	81,670	69,931
Liabilities held for sale	18,498	17,903
Total liabilities	157,696	145,198
Equity attributable to common shareholders	9,408	8,213
Noncontrolling interest	0	0
Total liabilities and shareholder's equity	167,104	153,411
CLOs
Assets:
Total investments and cash	0	0
Other assets	0	0
Assets held in consolidated investment entities	551	589
Assets held in separate accounts	0	0
Assets held for sale	0	0
Total assets	551	589
Liabilities and Shareholders' Equity:
Future policy benefits and contract owner account balances	0	0
Other liabilities	0	0
Liabilities held in consolidated investment entities	551	589
Liabilities related to separate accounts	0	0
Liabilities held for sale	0	0
Total liabilities	551	589
Equity attributable to common shareholders	0	0
Noncontrolling interest	0	0
Total liabilities and shareholder's equity	551	589
LPs and VOEs
Assets:
Total investments and cash	0	0
Other assets	0	0
Assets held in consolidated investment entities	1,675	1,721
Assets held in separate accounts	0	0
Assets held for sale	0	0
Total assets	1,675	1,721
Liabilities and Shareholders' Equity:
Future policy benefits and contract owner account balances	0	0
Other liabilities	0	0
Liabilities held in consolidated investment entities	607	646
Liabilities related to separate accounts	0	0
Liabilities held for sale	0	0
Total liabilities	607	646
Equity attributable to common shareholders	1,068	1,075
Noncontrolling interest	0	0
Total liabilities and shareholder's equity	1,675	1,721
CLOs Adjustments
Assets:
Total investments and cash	(32)	(7)
Other assets	0	0
Assets held in consolidated investment entities	0	0
Assets held in separate accounts	0	0
Assets held for sale	0	0
Total assets	(32)	(7)
Liabilities and Shareholders' Equity:
Future policy benefits and contract owner account balances	0	0
Other liabilities	0	0
Liabilities held in consolidated investment entities	(32)	(7)
Liabilities related to separate accounts	0	0
Liabilities held for sale	0	0
Total liabilities	(32)	(7)
Equity attributable to common shareholders	0	0
Noncontrolling interest	0	0
Total liabilities and shareholder's equity	(32)	(7)
LPs and VOEs Adjustments
Assets:
Total investments and cash	(246)	(283)
Other assets	(1)	(1)
Assets held in consolidated investment entities	0	0
Assets held in separate accounts	0	0
Assets held for sale	0	0
Total assets	(247)	(284)
Liabilities and Shareholders' Equity:
Future policy benefits and contract owner account balances	0	0
Other liabilities	0	0
Liabilities held in consolidated investment entities	(1)	(1)
Liabilities related to separate accounts	0	0
Liabilities held for sale	0	0
Total liabilities	(1)	(1)
Equity attributable to common shareholders	(1,068)	(1,075)
Noncontrolling interest	822	792
Total liabilities and shareholder's equity	(247)	(284)
Cash and cash equivalents
Assets:
Assets held in consolidated investment entities	68	331
Limited Partnerships/Corporations, at fair value
Assets:
Assets held in consolidated investment entities	1,632	1,421
Other assets
Assets:
Assets held in consolidated investment entities	13	16
VIEs
Variable Interest Entity, Consolidated, Carrying Amount, Assets [Abstract]
Assets of consolidated investment entities	2,063	2,201
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities [Abstract]
Liabilities of consolidated investment entities	1,124	1,221
VIEs | Cash and cash equivalents
Variable Interest Entity, Consolidated, Carrying Amount, Assets [Abstract]
Assets of consolidated investment entities	68	331
VIEs | Corporate loans, at fair value using the fair value option
Variable Interest Entity, Consolidated, Carrying Amount, Assets [Abstract]
Assets of consolidated investment entities	513	542
VIEs | Limited Partnerships/Corporations, at fair value
Variable Interest Entity, Consolidated, Carrying Amount, Assets [Abstract]
Assets of consolidated investment entities	1,470	1,313
VIEs | Other assets
Variable Interest Entity, Consolidated, Carrying Amount, Assets [Abstract]
Assets of consolidated investment entities	12	15
VIEs | CLO notes, at fair value using the fair value option
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities [Abstract]
Liabilities of consolidated investment entities	474	540
VIEs | Other liabilities
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities [Abstract]
Liabilities of consolidated investment entities	650	681
VOEs
Variable Interest Entity, Consolidated, Carrying Amount, Assets [Abstract]
Assets of consolidated investment entities	163	109
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities [Abstract]
Liabilities of consolidated investment entities	2	7
VOEs | Limited Partnerships/Corporations, at fair value
Variable Interest Entity, Consolidated, Carrying Amount, Assets [Abstract]
Assets of consolidated investment entities	162	108
VOEs | Other assets
Variable Interest Entity, Consolidated, Carrying Amount, Assets [Abstract]
Assets of consolidated investment entities	1	1
VOEs | Other liabilities
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities [Abstract]
Liabilities of consolidated investment entities	$ 2	$ 7