Investments (Net Investment Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Net Investment Income [Line Items]
Less: Investment expenses	$ 276	$ 300
Subtotal	5,035	6,077
Securities Investment [Member]
Net Investment Income [Line Items]
Subtotal	5,224	5,301
Subtotal	4,948	5,001
Debt Securities [Member]
Net Investment Income [Line Items]
Subtotal	3,653	3,826
Equity Securities [Member]
Net Investment Income [Line Items]
Subtotal	30	24
Actively traded securities and FVO general account securities [Member]
Net Investment Income [Line Items]
Subtotal	37	21
Changes in estimated fair value included in net investment income	11	13
Mortgage Loans on Real Estate [Member]
Net Investment Income [Line Items]
Subtotal	709	738
Policy Loans [Member]
Net Investment Income [Line Items]
Subtotal	157	155
Real Estate Investment [Member]
Net Investment Income [Line Items]
Subtotal	217	193
Partnership Interest [Member]
Net Investment Income [Line Items]
Subtotal	329	246
Cash and Cash Equivalents [Member]
Net Investment Income [Line Items]
Subtotal	47	49
International Joint Venture [Member]
Net Investment Income [Line Items]
Subtotal	0	(14)
Other Investments [Member]
Net Investment Income [Line Items]
Subtotal	45	63
Consolidated Securitization Entities And Fair Value Option Contractholder-Directed Unit-Linked [Member]
Net Investment Income [Line Items]
Subtotal	87	1,076
FVO contractholder-directed unit-linked investments [Member]
Net Investment Income [Line Items]
Subtotal	65	1,039
Changes in estimated fair value included in net investment income	(41)	956
Commercial Loan [Member] | Consolidated Securitization Entities [Member]
Net Investment Income [Line Items]
Subtotal	$ 22	$ 37