Summary of Significant Accounting Policies (Details - Changes in Accounting Pronouncements) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Condensed Consolidated Statement of Income
Revenue, excluding other revenues																		$ 21,621	$ 20,874
Other revenues																	121	244	254
Total revenues	7,620		7,323		7,422		6,754		5,425		5,574		5,479		5,387		29,119	21,865	21,128
Benefits and expenses, excluding other operating expenses																		13,927	13,457
Other operating expenses																	7,455	6,062	5,869
Total benefits and expenses																	26,642	19,989	19,326
Income from Continuing Operations before Income Taxes																	2,477	1,876	1,802
Current income taxes																	719	398	331
Deferred income taxes																	134	217	188
Total taxes																	853	615	519
Income from Discontinued Operations, Net of Taxes																	0	0	0
Net Income																	1,624	1,261	1,283
Less: Net Income Attributable to Noncontrolling Interest																		1	4
Shareholders' Net Income	406	[1]	466	[2]	380	[3]	371	[4]	273	[5]	183	[6]	391	[7]	413	[8]	1,623	1,260	1,279
Earnings per share:
Basic	$ 1.43		$ 1.64		$ 1.33		$ 1.30		$ 0.99		$ 0.68		$ 1.46		$ 1.53		$ 5.70	$ 4.65	$ 4.69
Diluted	$ 1.41		$ 1.61		$ 1.31		$ 1.28		$ 0.98		$ 0.67		$ 1.43		$ 1.51		$ 5.61	$ 4.59	$ 4.65
Condensed Consolidated Balance Sheets
Deferred policy acquisition cost	1,198								817								1,198	817
Deferred Tax Assets Liabilities Net	374								803								374	803
Other assets, including other intangibles	2,355								1,750								2,355	1,750
All other assets									47,327									47,327
Total assets	53,734								50,697								53,734	50,697
Net translation of foreign currencies	69								3								69	3
Retained earnings	12,330								10,787								12,330	10,787
Other shareholder's equity									(2,796)									(2,796)
Total shareholders' equity	9,769								7,994								9,769	7,994
Scenario, Previously Reported [Member]
Condensed Consolidated Statement of Income
Revenue, excluding other revenues																		21,621	20,874
Other revenues																		254	260
Total revenues																		21,875	21,134
Benefits and expenses, excluding other operating expenses																		13,927	13,457
Other operating expenses																		5,980	5,807
Total benefits and expenses																		19,907	19,264
Income from Continuing Operations before Income Taxes																		1,968	1,870
Current income taxes																		398	331
Deferred income taxes																		242	190
Total taxes																		640	521
Income from Discontinued Operations, Net of Taxes																		0	0
Net Income																		1,328	1,349
Less: Net Income Attributable to Noncontrolling Interest																		1	4
Shareholders' Net Income																		1,327	1,345
Earnings per share:
Basic																		$ 4.90	$ 4.93
Diluted																		$ 4.84	$ 4.89
Restatement Adjustment [Member]
Condensed Consolidated Statement of Income
Revenue, excluding other revenues																		0	0
Other revenues																		(10)	(6)
Total revenues																		(10)	(6)
Benefits and expenses, excluding other operating expenses																		0	0
Other operating expenses																		82	62
Total benefits and expenses																		82	62
Income from Continuing Operations before Income Taxes																		(92)	(68)
Current income taxes																		0	0
Deferred income taxes																		(25)	(2)
Total taxes																		(25)	(2)
Income from Discontinued Operations, Net of Taxes																		0	0
Net Income																		(67)	(66)
Less: Net Income Attributable to Noncontrolling Interest																		0	0
Shareholders' Net Income																		(67)	(66)
Earnings per share:
Basic																		$ (0.25)	$ (0.24)
Diluted																		$ (0.25)	$ (0.24)
Accounting Standards Update 201026 [Member] | Scenario, Previously Reported [Member]
Condensed Consolidated Balance Sheets
Deferred policy acquisition cost									1,312									1,312
Deferred Tax Assets Liabilities Net									632									632
Other assets, including other intangibles									1,776									1,776
All other assets									47,327									47,327
Total assets									51,047									51,047
Net translation of foreign currencies									(3)									(3)
Retained earnings									11,143									11,143
Other shareholder's equity									(2,796)									(2,796)
Total shareholders' equity									8,344									8,344
Accounting Standards Update 201026 [Member] | Restatement Adjustment [Member]
Condensed Consolidated Balance Sheets
Deferred policy acquisition cost									(495)									(495)
Deferred Tax Assets Liabilities Net									171									171
Other assets, including other intangibles									(26)									(26)
All other assets									0									0
Total assets									(350)									(350)
Net translation of foreign currencies									6									6
Retained earnings									(356)									(356)
Other shareholder's equity									0									0
Total shareholders' equity									$ (350)									$ (350)

[1] The fourth quarter of 2012 includes an after-tax gain of $7 million for the GMIB business and an after-tax charge of $68 million for litigation matters

[2] The third quarter of 2012 includes an after-tax gain of $32 million for the GMIB business, an after-tax charge of $12 million for costs associated with acquisitions, and an after-tax charge of $50 million for costs associated with a realignment and efficiency plan.

[3] The second quarter of 2012 includes an after-tax loss of $51 million for the GMIB business.

[4] The first quarter of 2012 includes an after-tax gain of $41 million for the GMIB business, an after-tax charge of $28 million for costs associated with acquisitions, and an after-tax charge of $13 million for costs associated a litigation matter in Global Health Care.

[5] The fourth quarter of 2011 includes an after-tax gain of $7 million for the GMIB business and, an after-tax charge of $31 million for costs associated with acquisitions.

[6] The third quarter of 2011 includes an after-tax loss of $134 million for the GMIB business.

[7] The second quarter of 2011 includes an after-tax loss of $21 million for the GMIB business.

[8] The first quarter of 2011 includes an after-tax gain of $13 million for the GMIB business and a net tax benefit of $24 million related to the resolution of a Federal tax matter.