CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Statement of Cash Flows [Abstract]
Net income	$ 887	$ 1,056
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation, amortization and accretion, net	91	107
Deferred income tax expense (benefit)	(64)	53
Share-based compensation	64	69
Net realized investment (gains) losses	(10)	(12)
Net trading (gains) losses	(6)	(6)
Loss from equity method investments	29	22
Other than Temporary Impairments and Provision for Loan Losses	5
Net (gains) losses of consolidated investment entities	5	(24)
Changes in operating assets and liabilities:
Restricted and segregated investments	124	224
Deferred acquisition costs	(76)	(9)
Policyholder account balances, future policy benefits and claims, net	259	(407)
Derivatives, net of collateral	280	205
Receivables	120	(121)
Brokerage deposits	(524)	(394)
Accounts payable and accrued expenses	(91)	(220)
Change in Other Operating Assets and Liabilities of Consolidated Investment Entities	(6)	4
Other, net	65	(49)
Net cash provided by (used in) operating activities	1,152	498
Available-for-Sale securities:
Proceeds from sales	110	401
Maturities, sinking fund payments and calls	4,012	3,124
Purchases	(5,294)	(3,900)
Proceeds from sales, maturities and repayments of mortgage loans	131	164
Funding of mortgage loans	(127)	(97)
Proceeds from sales, maturities and collections of other investments	149	502
Purchase of other investments	(159)	(389)
Purchase of investments by consolidated investment entities	(392)	(228)
Proceeds from sales, maturities and repayments of investments by consolidated investment entities	319	828
Purchase of land, buildings, equipment and software	(67)	(69)
Payments for Derivative Instrument, Investing Activities	(42)	(82)
Proceeds from Derivative Instrument, Investing Activities	44	81
Change In Reinsurance Deposit, Net	(306)
Other, net	(7)	(56)
Net cash provided by (used in) investing activities	(1,629)	279
Investment certificates:
Proceeds from additions	2,924	2,899
Maturities, withdrawals and cash surrenders	(2,873)	(2,381)
Policyholder account balances:
Deposits and other additions	1,151	985
Net transfers from (to) separate accounts	(28)	(59)
Surrenders and other benefits	(926)	(977)
Change in banking deposits, net	2,205
Cash paid for purchased options with deferred premiums	(95)	(129)
Cash received from purchased options with deferred premiums	60	119
Proceeds from Debt, Net of Issuance Costs	497
Repayments of long-term debt	(307)	(6)
Dividends paid to shareholders	(253)	(253)
Repurchase of common shares	(827)	(829)
Exercise of stock options	1	2
Repayments of debt by consolidated investment entities	(33)	(518)
Net cash provided by (used in) financing activities	1,496	(1,147)
Effect of exchange rate changes on cash	2
Cash and Cash Equivalents including Disposal Group, Period Increase (Decrease)	1,021	(370)
Less: Cash and Cash Equivalents of Disposal Group, Period Increase (Decrease)	166
Net increase (decrease) in cash and cash equivalents, including amounts restricted and cash balances classified as assets held-for-sale	855	(370)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Beginning of Period	5,883	5,144
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, End of Period	$ 6,738	$ 4,774