Income Tax (Details 3) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred income tax assets:
Policyholder liabilities and receivables	$ 6,233	$ 5,939
Net operating loss carryforwards	1,408	1,595
Employee benefits	1,234	916
Capital loss carryforwards	160	449
Tax credit carryforwards	545	1,692
Litigation-related and government mandated	197	207
Other	484	483
Total gross deferred income tax assets	10,261	11,281
Less: Valuation allowance	368	1,083
Total net deferred income tax assets	9,893	10,198
Deferred income tax liabilities:
Investments, including derivatives	3,149	3,371
Intangibles	2,668	5,309
Net unrealized investment gains	7,854	4,453
DAC	4,775	3,268
Other	140	192
Total deferred income tax liabilities	18,586	16,593
Deferred tax assets and liabilities [Abstract]
Net deferred income tax asset (liability)	$ (8,693)	$ (6,395)