Fair Value of Financial Instruments (Carrying and Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
AFS securities:
AFS Fixed Maturity Securities		$ 94,024	$ 94,840
Equity securities			246
Trading securities		1,950	1,620
Equity securities		99
Mortgage loans on real estate		13,260	10,762
Derivative investments		1,107	915
Other investments		2,255	2,296
Other contract holder funds:
Benefit Plans' Assets		1,420	1,626
Carrying Value [Member]
AFS securities:
Trading securities		1,950	1,620
Equity securities		99
Mortgage loans on real estate		13,260	10,762
Derivative investments	[1]	1,107	915
Other investments		2,255	2,296
Cash and invested cash		2,345	1,628
Other assets - GLB direct embedded derivatives		123	903
Other assets - GLB ceded embedded derivatives		72	51
Indexed annuity ceded embedded derivatives		902	11
Separate account assets		132,833	144,219
Other contract holder funds:
Remaining guaranteed interest and similar contracts		(542)	(592)
Account values of certain investment contracts		(34,535)	(32,370)
Short-term debt			(450)
Long-term debt		(5,839)	(4,894)
Reinsurance related embedded derivatives		(3)	(57)
Benefit Plans' Assets	[2]	1,420	1,626
Fair Value [Member]
AFS securities:
Trading securities		1,950	1,620
Equity securities		99
Mortgage loans on real estate		13,092	10,877
Derivative investments	[1]	1,107	915
Other investments		2,255	2,296
Cash and invested cash		2,345	1,628
Other assets - GLB direct embedded derivatives		123	903
Other assets - GLB ceded embedded derivatives		72	51
Indexed annuity ceded embedded derivatives		902	11
Separate account assets		132,833	144,219
Other contract holder funds:
Remaining guaranteed interest and similar contracts		(542)	(592)
Account values of certain investment contracts		(36,358)	(36,200)
Short-term debt			(452)
Long-term debt		(5,604)	(5,042)
Reinsurance related embedded derivatives		(3)	(57)
Benefit Plans' Assets	[2]	1,420	1,626
Fixed Maturity AFS Securities [Member] | Carrying Value [Member]
AFS securities:
AFS Fixed Maturity Securities		94,024	94,840
Fixed Maturity AFS Securities [Member] | Fair Value [Member]
AFS securities:
AFS Fixed Maturity Securities		94,024	94,840
Equity Securities [Member] | Carrying Value [Member]
AFS securities:
Equity securities			246
Equity Securities [Member] | Fair Value [Member]
AFS securities:
Equity securities			246
Future Contract Benefits [Member] | Carrying Value [Member]
Future contract benefits:
Indexed annuity and IUL contracts embedded derivatives		(1,305)	(1,418)
Future Contract Benefits [Member] | Fair Value [Member]
Future contract benefits:
Indexed annuity and IUL contracts embedded derivatives		(1,305)	(1,418)
Other Liabilities [Member] | Carrying Value [Member]
Other contract holder funds:
Other liabilities - derivative liabilities	[1]	(160)	(338)
Other Liabilities [Member] | Fair Value [Member]
Other contract holder funds:
Other liabilities - derivative liabilities	[1]	$ (160)	(338)
Other Liabilities [Member] | GLB Ceded Embedded Derivatives [Member] | Carrying Value [Member]
Other contract holder funds:
Other liabilities - GLB embedded derivatives			(67)
Other Liabilities [Member] | GLB Ceded Embedded Derivatives [Member] | Fair Value [Member]
Other contract holder funds:
Other liabilities - GLB embedded derivatives			$ (67)

[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.