Consolidated Statement of Income (Unaudited) - USD ($) shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues
Premiums		$ 6,695	$ 6,351	$ 13,232	$ 12,534
Net investment income		595	598	1,198	1,208
Fee income		112	116	215	229
Net realized investment gains	[1]	36	80	25	85
Other revenues		39	39	93	70
Total revenues		7,477	7,184	14,763	14,126
Claims and expenses
Claims and claim adjustment expenses		4,562	4,225	8,858	8,319
Amortization of deferred acquisition costs		1,081	1,032	2,142	2,035
General and administrative expenses		1,113	1,045	2,175	2,041
Interest expense		90	92	179	181
Total claims and expenses		6,846	6,394	13,354	12,576
Income before income taxes		631	790	1,409	1,550
Income tax expense		107	195	216	338
Net income		$ 524	$ 595	$ 1,193	$ 1,212
Net income per share
Basic (in dollars per share)		$ 1.93	$ 2.13	$ 4.39	$ 4.32
Diluted (in dollars per share)		$ 1.92	$ 2.11	$ 4.35	$ 4.28
Weighted average number of common shares outstanding
Basic (in shares)		268.7	277.5	269.8	278.6
Diluted (in shares)		271.1	280.0	272.5	281.2
Cash dividends declared per common share (in dollars per share)		$ 0.77	$ 0.72	$ 1.49	$ 1.39

[1] Total other-than-temporary impairment (OTTI) losses were $(1) million and $(5) million for the three months ended June 30, 2018 and 2017, respectively, and $(1) million and $(6) million for the six months ended June 30, 2018 and 2017, respectively. Of total OTTI, credit losses of $(1) million and $(5) million for the three months ended June 30, 2018 and 2017, respectively, and $(1) million and $(7) million for the six months ended June 30, 2018 and 2017, respectively, were recognized in net realized investment gains. In addition, unrealized gains (losses) from other changes in total OTTI of $0 million for each of the three months ended June 30, 2018 and 2017, respectively, and $0 million and $1 million for the six months ended June 30, 2018 and 2017, respectively, were recognized in other comprehensive income (loss) as part of changes in net unrealized gains (losses) on investment securities having credit losses recognized in the consolidated statement of income.