Fair Value of Financial Instruments (Carrying and Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Millions		Dec. 31, 2016	Dec. 31, 2015
AFS securities:
AFS Fixed Maturity Securities		$ 89,013	$ 84,964
Variable interest entities' fixed maturity securities		200	598
AFS Equity securities		275	237
Trading securities		1,712	1,854
Mortgage loans on real estate		9,889	8,678
Derivative investments		927	1,537
Other investments		2,230	1,778
Other contract holder funds:
Benefit Plans' Assets		1,489	1,486
Parent Company [Member]
AFS securities:
Derivative investments		213	253
Other investments		51	40
Carrying Value [Member]
AFS securities:
Trading securities		1,712	1,854
Mortgage loans on real estate		9,889	8,678
Derivative investments	[1]	927	1,537
Other investments		2,230	1,778
Cash and invested cash		2,722	3,146
Other assets - reinsurance recoverable		203	268
Separate account assets		128,397	123,619
Other contract holder funds:
Remaining guaranteed interest and similar contracts		(629)	(687)
Account values of certain investment contracts		(31,516)	(30,392)
Long-term debt		(5,345)	(5,553)
Reinsurance related embedded derivatives		(53)	(87)
VIEs' liabilities - derivative instruments			(4)
Benefit Plans' Assets	[2]	1,489	1,486
Fair Value [Member]
AFS securities:
Trading securities		1,712	1,854
Mortgage loans on real estate		9,853	8,936
Derivative investments	[1]	927	1,537
Other investments		2,230	1,778
Cash and invested cash		2,722	3,146
Other assets - reinsurance recoverable		203	268
Separate account assets		128,397	123,619
Other contract holder funds:
Remaining guaranteed interest and similar contracts		(629)	(687)
Account values of certain investment contracts		(35,647)	(34,618)
Long-term debt		(5,679)	(5,505)
Reinsurance related embedded derivatives		(53)	(87)
VIEs' liabilities - derivative instruments			(4)
Benefit Plans' Assets	[2]	1,489	1,486
VIEs' fixed maturity securities [Member] | Carrying Value [Member]
AFS securities:
Variable interest entities' fixed maturity securities		200	598
VIEs' fixed maturity securities [Member] | Fair Value [Member]
AFS securities:
Variable interest entities' fixed maturity securities		200	598
Fixed maturity AFS securities [Member] | Carrying Value [Member]
AFS securities:
AFS Fixed Maturity Securities		89,013	84,964
Fixed maturity AFS securities [Member] | Fair Value [Member]
AFS securities:
AFS Fixed Maturity Securities		89,013	84,964
Equity AFS securities [Member] | Carrying Value [Member]
AFS securities:
AFS Equity securities		275	237
Equity AFS securities [Member] | Fair Value [Member]
AFS securities:
AFS Equity securities		275	237
Future contract benefits [Member] | Carrying Value [Member]
Future contract benefits:
Indexed annuity and IUL contracts embedded derivatives		(1,139)	(1,100)
Future contract benefits [Member] | Fair Value [Member]
Future contract benefits:
Indexed annuity and IUL contracts embedded derivatives		(1,139)	(1,100)
Other liabilities [Member] | Carrying Value [Member]
Other contract holder funds:
Other liabilities - credit default swaps			(9)
Other liabilities - derivative liabilities	[1]	(553)	(69)
Other liabilities - GLB reserves embedded derivatives	[3]	(371)	(953)
Other liabilities [Member] | Fair Value [Member]
Other contract holder funds:
Other liabilities - credit default swaps			(9)
Other liabilities - derivative liabilities	[1]	(553)	(69)
Other liabilities - GLB reserves embedded derivatives	[3]	$ (371)	$ (953)

[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] 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.

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