Fair Value of Financial Instruments (Carrying and Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
AFS securities:
AFS Fixed Maturity Securities		$ 88,064	$ 84,964
Variable interest entities' fixed maturity securities		599	598
AFS Equity securities		245	237
Trading securities		1,864	1,854
Mortgage loans on real estate		8,916	8,678
Derivative investments		2,085	1,537
Other investments		2,048	1,778
Carrying Value [Member]
AFS securities:
AFS Equity securities		245	237
Trading securities		1,864	1,854
Mortgage loans on real estate		8,916	8,678
Derivative investments	[1]	2,085	1,537
Other investments	[2]	2,048	1,778
Cash and invested cash		3,177	3,146
Other assets - reinsurance recoverable		433	268
Separate account assets		123,506	123,619
Future contract benefits:
Indexed annuity and IUL contracts embedded derivatives		(1,088)	(1,100)
Other contract holder funds:
Remaining guaranteed interest and similar contracts		(678)	(687)
Account values of certain investment contracts		(30,771)	(30,392)
Long-term debt		(5,650)	(5,553)
Reinsurance related embedded derivatives		(111)	(87)
VIEs' liabilities - derivative instruments			(4)
Other liabilities - credit default swaps		(12)	(9)
Other liabilities - derivative liabilities	[1]	(216)	(69)
Other liabilities - GLB reserves embedded derivatives	[3]	(1,916)	(953)
Fair Value [Member]
AFS securities:
AFS Equity securities		245	237
Trading securities		1,864	1,854
Mortgage loans on real estate		9,350	8,936
Derivative investments	[1]	2,085	1,537
Other investments	[2]	2,048	1,778
Cash and invested cash		3,177	3,146
Other assets - reinsurance recoverable		433	268
Separate account assets		123,506	123,619
Future contract benefits:
Indexed annuity and IUL contracts embedded derivatives		(1,088)	(1,100)
Other contract holder funds:
Remaining guaranteed interest and similar contracts		(678)	(687)
Account values of certain investment contracts		(35,831)	(34,618)
Long-term debt		(5,350)	(5,505)
Reinsurance related embedded derivatives		(111)	(87)
VIEs' liabilities - derivative instruments			(4)
Other liabilities - credit default swaps		(12)	(9)
Other liabilities - derivative liabilities	[1]	(216)	(69)
Other liabilities - GLB reserves embedded derivatives	[3]	(1,916)	(953)
VIEs' fixed maturity securities [Member] | Carrying Value [Member]
AFS securities:
Variable interest entities' fixed maturity securities		599	598
VIEs' fixed maturity securities [Member] | Fair Value [Member]
AFS securities:
Variable interest entities' fixed maturity securities		599	598
Fixed maturity AFS securities [Member] | Carrying Value [Member]
AFS securities:
AFS Fixed Maturity Securities		88,064	84,964
Fixed maturity AFS securities [Member] | Fair Value [Member]
AFS securities:
AFS Fixed Maturity Securities		$ 88,064	$ 84,964

[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] Includes credit default swaps in an asset position associated with consolidated VIEs.

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