Fair Value of Financial Instruments (Carrying and Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
AFS securities:
AFS Fixed Maturity Securities		$ 93,014	$ 89,013
Variable interest entities' fixed maturity securities			200
AFS Equity securities		275	275
Trading securities		1,678	1,712
Mortgage loans on real estate		10,023	9,889
Derivative investments		1,054	927
Other investments		2,156	2,230
Carrying Value [Member]
AFS securities:
AFS Equity securities		275	275
Trading securities		1,678	1,712
Mortgage loans on real estate		10,023	9,889
Derivative investments	[1]	1,054	927
Other investments		2,156	2,230
Cash and invested cash		1,978	2,722
Other assets - GLB direct embedded derivatives	[2]	298
Other assets - GLB ceded embedded derivatives		85	203
Separate account assets		135,825	128,397
Future contract benefits:
Indexed annuity and IUL contracts embedded derivatives		(1,268)	(1,139)
Other contract holder funds:
Remaining guaranteed interest and similar contracts		(625)	(629)
Account values of certain investment contracts		(31,982)	(31,516)
Short-term debt		(450)
Long-term debt		(4,901)	(5,345)
Reinsurance related embedded derivatives		(53)	(53)
Other liabilities - derivative liabilities	[1]	(169)	(553)
Other liabilities - GLB direct embedded derivatives	[2]		(371)
Fair Value [Member]
AFS securities:
AFS Equity securities		275	275
Trading securities		1,678	1,712
Mortgage loans on real estate		10,157	9,853
Derivative investments	[1]	1,054	927
Other investments		2,156	2,230
Cash and invested cash		1,978	2,722
Other assets - GLB direct embedded derivatives	[2]	298
Other assets - GLB ceded embedded derivatives		85	203
Separate account assets		135,825	128,397
Future contract benefits:
Indexed annuity and IUL contracts embedded derivatives		(1,268)	(1,139)
Other contract holder funds:
Remaining guaranteed interest and similar contracts		(625)	(629)
Account values of certain investment contracts		(36,201)	(35,647)
Short-term debt		(457)
Long-term debt		(5,485)	(5,679)
Reinsurance related embedded derivatives		(53)	(53)
Other liabilities - derivative liabilities	[1]	(169)	(553)
Other liabilities - GLB direct embedded derivatives	[2]		(371)
VIEs' fixed maturity securities [Member] | Carrying Value [Member]
AFS securities:
Variable interest entities' fixed maturity securities			200
VIEs' fixed maturity securities [Member] | Fair Value [Member]
AFS securities:
Variable interest entities' fixed maturity securities			200
Fixed maturity AFS securities [Member] | Carrying Value [Member]
AFS securities:
AFS Fixed Maturity Securities		93,014	89,013
Fixed maturity AFS securities [Member] | Fair Value [Member]
AFS securities:
AFS Fixed Maturity Securities		$ 93,014	$ 89,013

[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 direct embedded derivatives are ceded to third-party reinsurance counterparties. Refer to Note 5 for additional detail.