Fair Value of Financial Instruments (Carrying and Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014
AFS securities:
AFS Fixed Maturity Securities		$ 84,964	$ 86,240
Variable interest entities' fixed maturity securities		598	598
AFS Equity securities		237	231
Trading securities		1,854	2,065
Mortgage loans on real estate		8,678	7,574
Derivative investments		1,537	1,860
Other investments		1,778	1,709
Other contract holder funds:
Benefit Plans' Assets		1,486	1,570
Parent Company [Member]
AFS securities:
Derivative investments		253	298
Other investments		40	5
Carrying Value [Member]
AFS securities:
Trading securities		1,854	2,065
Mortgage loans on real estate		8,678	7,574
Derivative investments	[1]	1,537	1,860
Other investments		1,778	1,709
Cash and invested cash		3,146	3,919
Other assets - reinsurance recoverable		268	154
Separate account assets		123,619	125,265
Other contract holder funds:
Remaining guaranteed interest and similar contracts		(687)	(699)
Account values of certain investment contracts		(30,392)	(29,156)
Short-term debt	[2]		(250)
Long-term debt		(5,582)	(5,270)
Reinsurance related embedded derivatives		(87)	(150)
VIEs' liabilities - derivative instruments		(4)	(13)
Benefit Plans' Assets	[3]	1,486	1,570
Fair Value [Member]
AFS securities:
Trading securities		1,854	2,065
Mortgage loans on real estate		8,936	8,038
Derivative investments	[1]	1,537	1,860
Other investments		1,778	1,709
Cash and invested cash		3,146	3,919
Other assets - reinsurance recoverable		268	154
Separate account assets		123,619	125,265
Other contract holder funds:
Remaining guaranteed interest and similar contracts		(687)	(699)
Account values of certain investment contracts		(34,618)	(33,079)
Short-term debt	[2]		(253)
Long-term debt		(5,505)	(5,707)
Reinsurance related embedded derivatives		(87)	(150)
VIEs' liabilities - derivative instruments		(4)	(13)
Benefit Plans' Assets	[3]	1,486	1,570
VIEs' fixed maturity securities [Member] | Carrying Value [Member]
AFS securities:
Variable interest entities' fixed maturity securities		598	598
VIEs' fixed maturity securities [Member] | Fair Value [Member]
AFS securities:
Variable interest entities' fixed maturity securities		598	598
Fixed Maturity AFS Securities [Member] | Carrying Value [Member]
AFS securities:
AFS Fixed Maturity Securities		84,964	86,240
Fixed Maturity AFS Securities [Member] | Fair Value [Member]
AFS securities:
AFS Fixed Maturity Securities		84,964	86,240
Available-for-sale equity securities [Member] | Carrying Value [Member]
AFS securities:
AFS Equity securities		237	231
Available-for-sale equity securities [Member] | Fair Value [Member]
AFS securities:
AFS Equity securities		237	231
Future contract benefits [Member] | Carrying Value [Member]
Future contract benefits:
Indexed annuity and IUL contracts embedded derivatives		(1,100)	(1,170)
Future contract benefits [Member] | Fair Value [Member]
Future contract benefits:
Indexed annuity and IUL contracts embedded derivatives		(1,100)	(1,170)
Other Liabilities [Member] | Carrying Value [Member]
Other contract holder funds:
Other liabilities - credit default swaps		(9)	(3)
Other liabilities - derivative liabilities	[1]	(69)	(77)
Other liabilities - GLB reserves embedded derivatives	[4]	(953)	(174)
Other Liabilities [Member] | Fair Value [Member]
Other contract holder funds:
Other liabilities - credit default swaps		(9)	(3)
Other liabilities - derivative liabilities	[1]	(69)	(77)
Other liabilities - GLB reserves embedded derivatives	[4]	$ (953)	$ (174)

[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] The difference between the carrying value and fair value of short-term debt as of December 31, 2014, related to current maturities of long-term debt.

[3] Included in the funded statuses of the benefit plans, which is reported in other liabilities on our Consolidated Balance Sheets. Refer to Note 17 for information regarding our benefit plans.

[4] Portions of our GLB reserves embedded derivatives are ceded to third-party reinsurance counterparties. Refer to Note 6 for additional detail.