Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities
Net income	$ 1,274	$ 517
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and other non-cash items	238	188
Realized capital gains and losses	(215)	125
Gain on disposition of operations	(14)	(3)
Interest credited to contractholder funds	348	375
Changes in:
Policy benefits and other insurance reserves	228	577
Unearned premiums	34	62
Deferred policy acquisition costs	(65)	(72)
Premium installment receivables, net	(51)	(27)
Reinsurance recoverables, net	6	(120)
Income taxes	(42)	(176)
Other operating assets and liabilities	(393)	(88)
Net cash provided by operating activities	1,348	1,358
Proceeds from sales
Fixed income securities	14,521	12,589
Equity securities	3,430	2,487
Limited partnership interests	481	363
Other investments	118	144
Investment collections
Fixed income securities	2,063	2,138
Mortgage loans	305	150
Other investments	337	168
Investment purchases
Fixed income securities	(17,214)	(12,947)
Equity securities	(3,473)	(2,672)
Limited partnership interests	(578)	(703)
Mortgage loans	(148)	(264)
Other investments	(532)	(449)
Change in short-term investments, net	2,142	(669)
Change in other investments, net	107	(39)
Purchases of property and equipment, net	(146)	(120)
Acquisition of operations	(1,356)	0
Net cash provided by investing activities	57	176
Cash flows from financing activities
Repayments of long-term debt	0	(16)
Contractholder fund deposits	515	522
Contractholder fund withdrawals	(957)	(1,013)
Dividends paid on common stock	(257)	(240)
Dividends paid on preferred stock	(58)	(58)
Treasury stock purchases	(657)	(904)
Shares reissued under equity incentive plans, net	108	72
Excess tax benefits on share-based payment arrangements	0	20
Other	(53)	34
Net cash used in financing activities	(1,359)	(1,583)
Net increase (decrease) in cash	46	(49)
Cash at beginning of period	436	495
Cash at end of period	$ 482	$ 446