Consolidated Statements Of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended									12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues:
Premiums										$ 38,829	$ 37,009	$ 35,106
Services										2,109	1,726	1,360
Investment income										375	391	366
Total revenues	10,187	[1]	10,319	10,321	10,486	9,557	9,651	9,699	10,219	41,313	39,126	36,832
Operating expenses:
Benefits										32,564	30,985	28,823
Operating costs										6,355	5,830	5,395
Depreciation and amortization										333	295	270
Total operating expenses										39,252	37,110	34,488
Income from operations										2,061	2,016	2,344
Interest expense										140	105	109
Income before income taxes	(49)	[1]	586	654	730	282	675	564	390	1,921	1,911	2,235
Provision for income taxes										690	689	816
Net income	$ (30)	[1]	$ 368	$ 420	$ 473	$ 192	$ 426	$ 356	$ 248	$ 1,231	$ 1,222	$ 1,419
Basic earnings per common share	$ (0.19)	[1]	$ 2.34	$ 2.66	$ 2.97	$ 1.21	$ 2.65	$ 2.19	$ 1.51	$ 7.81	$ 7.56	$ 8.58
Diluted earnings per common share	$ (0.19)	[1]	$ 2.31	$ 2.63	$ 2.95	$ 1.19	$ 2.62	$ 2.16	$ 1.49	$ 7.73	$ 7.47	$ 8.46
Dividends declared per common share										$ 1.07	$ 1.03	$ 0.75

[1] The sum of quarterly amounts does not equal full year results due to the anti-dilutive impact of a loss in the fourth quarter. The fourth quarter includes an expense of $243 million ($154 million after tax, or $0.99 per diluted common share) for reserve strengthening associated with our closed block of long-term care insurance policies.