CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Cash Flows [Abstract]
Net income	$ 1,893	$ 2,098	$ 1,480
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion, net	183	198	234
Deferred income tax expense (benefit)	(308)	25	156
Share-based compensation	135	144	121
Gain (Loss) on Disposition of Business before Affinity Payment	(313)
Net realized investment (gains) losses	(16)	(9)	(50)
Net trading (gains) losses	(10)	(12)	(7)
Loss from equity method investments	95	63	100
Other-than-temporary impairments and provision for loan losses	22
Net (gains) losses of consolidated investment entities	9	(47)	5
Changes in operating assets and liabilities:
Restricted and segregated investments	124	499	(348)
Deferred acquisition costs	(112)	4	(35)
Policyholder account balances, future policy benefits and claims, net	358	528	(441)
Derivatives, net of collateral	415	(144)	595
Receivables	324	(398)	(457)
Brokerage deposits	(519)	(255)	(198)
Accounts payable and accrued expenses	46	(100)	206
Other operating assets and liabilities of consolidated investment entities, net	(12)	29
Other, net	27	(26)	162
Net Cash Provided by (Used in) Operating Activities	2,341	2,597	1,523
Available-for-Sale securities:
Proceeds from sales	242	435	454
Maturities, sinking fund payments and calls	8,202	6,738	4,957
Purchases	(11,911)	(8,346)	(5,419)
Proceeds from sales, maturities and repayments of mortgage loans	272	295	699
Funding of mortgage loans	(354)	(235)	(479)
Proceeds from sales, maturities and collections of other investments	276	722	329
Purchase of other investments	(288)	(653)	(519)
Purchase of investments by consolidated investment entities	(644)	(411)	(1,268)
Proceeds from sales, maturities and repayments of investments by consolidated investment entities	684	1,086	1,349
Purchase of land, buildings, equipment and software	(143)	(162)	(162)
Proceeds from Divestiture of Businesses, Net of Cash Divested	934
Proceeds from Divestiture of Businesses	1,100
Cash paid for written options with deferred premiums	(308)	(133)	(82)
Cash received from written options with deferred premiums	170	133	77
Cash paid for deposit receivable	(349)
Cash received for deposit receivable	98
Other, net	(115)	(56)	(107)
Net cash (used in) provided by investing activities	(3,234)	(587)	(171)
Investment certificates:
Proceeds from additions	5,110	6,238	4,725
Maturities, withdrawals and cash surrenders	(5,489)	(4,745)	(4,262)
Policyholder account balances:
Deposits and other additions	2,152	1,933	2,059
Net transfers to (from) separate accounts	(86)	(75)	(157)
Surrenders and other benefits	(1,728)	(1,904)	(1,893)
Change in banking deposits, net	3,788
Cash paid for purchased options with deferred premiums	(396)	(228)	(282)
Cash received for purchased options with deferred premiums	206	254	116
Issuance of long-term debt, net of issuance costs	497
Repayments of long-term debt	(313)	(13)	(11)
Dividends paid to shareholders	(504)	(506)	(491)
Repurchase of common shares	(1,943)	(1,630)	(1,485)
Exercise of stock options	3	2	15
Borrowings of Consolidated Investment Entities		936
Repayments of debt by consolidated investment entities	(84)	(1,528)	(118)
Other, net	1	3	(1)
Net cash provided by (used in) financing activities	1,214	(1,263)	(1,785)
Effect of exchange rate changes on cash	9	(8)	35
Net increase (decrease) in cash and cash equivalents, including amounts restricted	330	739	(398)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, beginning balance	5,883	5,144	5,542
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, ending balance	$ 6,213	$ 5,883	$ 5,144