Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash Flows from Operating Activities
Net income	$ 899	$ 859	$ 479
Adjustments to reconcile net income to net cash flows provided by operating activities:
Deferred income tax expense (benefit)	168	136	(150)
Trading portfolio activity	9	(9)	17
Net realized investment (gains) losses	(93)	(50)	67
Equity method investees	84	238	195
Net amortization of investments	(40)	(27)	17
Depreciation and amortization	88	77	84
Changes in:
Receivables, net	92	(130)	82
Accrued investment income	(4)	(3)	(1)
Deferred acquisition costs	(24)	(8)	311
Insurance reserves	22	237	241
Other assets	(158)	(95)	(79)
Other liabilities	173	162	126
Other, net	38	29	(2)
Total adjustments	355	557	908
Net cash flows provided by operating activities	1,254	1,416	1,387
Dispositions:
Fixed maturity securities - sales	5,438	5,328	4,390
Fixed maturity securities - maturities, calls and redemptions	3,641	3,219	4,095
Equity securities	46	81	57
Limited partnerships	192	290	174
Mortgage loans	26	207	26
Purchases:
Fixed maturity securities	(9,065)	(9,827)	(8,675)
Equity securities	(166)	0	(62)
Limited partnerships	(171)	(252)	(188)
Mortgage loans	(274)	(120)	(123)
Change in other investments	(3)	7	4
Change in short term investments	(6)	258	34
Purchases of property and equipment	(102)	(146)	(125)
Disposals of property and equipment	0	107	0
Other, net	20	2	21
Net cash flows used by investing activities	(424)	(846)	(372)
Cash Flows from Financing Activities
Dividends paid to common stockholders	(842)	(813)	(811)
Proceeds from the issuance of debt	496	498	0
Repayment of debt	(391)	(358)	0
Other, net	(18)	0	4
Net cash flows used by financing activities	(755)	(673)	(807)
Effect of foreign exchange rate changes on cash	9	(13)	(11)
Net change in cash	84	(116)	197
Cash, beginning of year	271	387	190
Cash, end of year	$ 355	$ 271	$ 387