Fair Value of Financial Instruments (Carrying and Estimated Fair Values of Financial Instruments) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
AFS securities:
AFS debt securities	$ 80,235		$ 82,036
AFS Equity securities	209		157
Derivative investments	1,683		2,652
Cash and invested cash	2,574		4,230
Carrying Value [Member]
AFS securities:
AFS Equity securities	209		157
Trading Securities, Fair Value Disclosure	2,391		2,554
Mortgage loans on real estate	7,033		7,029
Derivative investments	1,683		2,652
Other investments	1,158		1,098
Cash and invested cash	2,574		4,230
Future contract benefits - GLB reserves embedded derivatives	292
Separate account assets	102,783		95,373
Future contract benefits:
Indexed annuity contracts embedded derivatives	(862)		(732)
GLB reserves embedded derivatives			(909)
Other contract holder funds:
Remaining guaranteed interest and similar contracts	(851)		(867)
Account values of certain investment contracts	(28,819)	[1]	(28,540)	[1]
Short-term debt	(506)		(200)
Long-term debt	(5,050)		(5,439)
Reinsurance related embedded derivatives	(131)		(215)
Variable interest entities' liabilities - derivative instruments	(101)		(128)
Other liabilities - credit default swaps	(8)		(11)
Fair Value [Member]
AFS securities:
AFS Equity securities	209		157
Trading Securities, Fair Value Disclosure	2,391		2,554
Mortgage loans on real estate	7,434		7,704
Derivative investments	1,683		2,652
Other investments	1,158		1,098
Cash and invested cash	2,574		4,230
Future contract benefits - GLB reserves embedded derivatives	292
Separate account assets	102,783		95,373
Future contract benefits:
Indexed annuity contracts embedded derivatives	(862)		(732)
GLB reserves embedded derivatives			(909)
Other contract holder funds:
Remaining guaranteed interest and similar contracts	(851)		(867)
Account values of certain investment contracts	(30,672)	[1]	(32,688)	[1]
Short-term debt	(512)		(204)
Long-term debt	(5,404)		(5,824)
Reinsurance related embedded derivatives	(131)		(215)
Variable interest entities' liabilities - derivative instruments	(101)		(128)
Other liabilities - credit default swaps	(8)		(11)
Fixed Maturity AFS Securities [Member] | Carrying Value [Member]
AFS securities:
AFS debt securities	80,235		82,036
Fixed Maturity AFS Securities [Member] | Fair Value [Member]
AFS securities:
AFS debt securities	80,235		82,036
VIEs' Fixed Maturity Securities [Member] | Carrying Value [Member]
AFS securities:
AFS debt securities	698		708
VIEs' Fixed Maturity Securities [Member] | Fair Value [Member]
AFS securities:
AFS debt securities	$ 698		$ 708

[1] The difference between the carrying value and fair value of short-term debt as of June 30, 2013, and December 31, 2012, related to current maturities of long-term debt.