Fair Value of Financial Instruments (Carrying and Estimated Fair Values of Financial Instruments) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
AFS securities:
AFS Fixed Maturity Securities	$ 88,813		$ 86,240
AFS Equity securities	210		231
Trading securities	2,077		2,065
Mortgage loans on real estate	7,654		7,574
Derivative investments	2,095		1,860
Other investments	1,885		1,709
Carrying Value [Member]
AFS securities:
AFS Equity securities	210		231
Trading securities	2,077		2,065
Mortgage loans on real estate	7,654		7,574
Derivative investments	2,095	[1]	1,860	[1]
Other investments	1,885		1,709
Cash and invested cash	3,487		3,919
Other assets - reinsurance recoverable	204		154
Separate account assets	127,828		125,265
Future contract benefits:
Indexed annuity and IUL contracts embedded derivatives	(1,180)		(1,170)
Other contract holder funds:
Remaining guaranteed interest and similar contracts	(687)		(699)
Account values of certain investment contracts	(29,990)		(29,156)
Short-term debt	(250)		(250)
Long-term debt	(5,627)		(5,270)
Reinsurance related embedded derivatives	(165)		(150)
VIEs' liabilities - derivative instruments	(5)		(13)
Other liabilities - credit default swaps	(3)		(3)
Other liabilities - derivative Liabilities	(92)	[1]	(77)	[1]
Other liabilities - GLB reserves embedded derivatives	(552)	[2]	(174)	[2]
Fair Value [Member]
AFS securities:
AFS Equity securities	210		231
Trading securities	2,077		2,065
Mortgage loans on real estate	8,172		8,038
Derivative investments	2,095	[1]	1,860	[1]
Other investments	1,885		1,709
Cash and invested cash	3,487		3,919
Other assets - reinsurance recoverable	204		154
Separate account assets	127,828		125,265
Future contract benefits:
Indexed annuity and IUL contracts embedded derivatives	(1,180)		(1,170)
Other contract holder funds:
Remaining guaranteed interest and similar contracts	(687)		(699)
Account values of certain investment contracts	(34,666)		(33,079)
Short-term debt	(252)		(253)
Long-term debt	(6,035)		(5,707)
Reinsurance related embedded derivatives	(165)		(150)
VIEs' liabilities - derivative instruments	(5)		(13)
Other liabilities - credit default swaps	(3)		(3)
Other liabilities - derivative Liabilities	(92)	[1]	(77)	[1]
Other liabilities - GLB reserves embedded derivatives	(552)	[2]	(174)	[2]
VIEs' Fixed Maturity Securities [Member] | Carrying Value [Member]
AFS securities:
AFS Fixed Maturity Securities	598		598
VIEs' Fixed Maturity Securities [Member] | Fair Value [Member]
AFS securities:
AFS Fixed Maturity Securities	598		598
Fixed Maturity AFS Securities [Member] | Carrying Value [Member]
AFS securities:
AFS Fixed Maturity Securities	88,813		86,240
Fixed Maturity AFS Securities [Member] | Fair Value [Member]
AFS securities:
AFS Fixed Maturity Securities	$ 88,813		$ 86,240

[1] We have master netting agreements with each of our derivative counterparties, which allow for the netting of our derivative asset and liability positions by counterparty.

[2] Portions of our GLB reserves embedded derivatives are ceded to third-party reinsurance counterparties. Refer to Note 5 for additional detail.