Fair Value of Financial Instruments (Carrying and Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Millions		Dec. 31, 2019	Dec. 31, 2018
Assets
Fixed maturity AFS securities		$ 103,773	$ 92,787
Trading securities		4,602	1,869
Equity securities		103	99
Mortgage loans on real estate		16,244	13,190
Derivative investments		1,911	1,081
Other investments		2,565	1,962
Other contract holder funds:
Benefit Plans' Assets		118	115
Carrying Value [Member]
Assets
Trading securities		4,602	1,869
Equity securities		103	99
Mortgage loans on real estate		16,244	13,190
Derivative investments	[1]	1,911	1,081
Other investments		2,554	1,951
Cash and invested cash		1,879	1,848
Reinsurance related embedded derivatives			188
Indexed annuity ceded embedded derivatives		927	902
Separate account assets		153,571	132,833
Other contract holder funds:
Remaining guaranteed interest and similar contracts		(1,900)	(542)
Account values of certain investment contracts		(38,606)	(34,500)
Short-term debt		(609)	(288)
Long-term debt		(2,414)	(2,401)
Reinsurance related embedded derivatives		(375)
Benefit Plans' Assets	[2]	118	115
Fair Value [Member]
Assets
Trading securities		4,602	1,869
Equity securities		103	99
Mortgage loans on real estate		16,774	13,020
Derivative investments	[1]	1,911	1,081
Other investments		2,554	1,951
Cash and invested cash		1,879	1,848
Reinsurance related embedded derivatives			188
Indexed annuity ceded embedded derivatives		927	902
Separate account assets		153,571	132,833
Other contract holder funds:
Remaining guaranteed interest and similar contracts		(1,900)	(542)
Account values of certain investment contracts		(46,781)	(36,321)
Short-term debt		(609)	(288)
Long-term debt		(2,714)	(2,519)
Reinsurance related embedded derivatives		(375)
Benefit Plans' Assets	[2]	118	115
Fixed Maturity Securities [Member] | Carrying Value [Member]
Assets
Fixed maturity AFS securities		103,773	92,787
Fixed Maturity Securities [Member] | Fair Value [Member]
Assets
Fixed maturity AFS securities		103,773	92,787
GLB Direct Embedded Derivatives [Member] | Carrying Value [Member]
Assets
Other assets - GLB embedded derivatives		450	123
GLB Direct Embedded Derivatives [Member] | Fair Value [Member]
Assets
Other assets - GLB embedded derivatives		450	123
GLB Ceded Embedded Derivatives [Member] | Carrying Value [Member]
Assets
Other assets - GLB embedded derivatives		60	72
GLB Ceded Embedded Derivatives [Member] | Fair Value [Member]
Assets
Other assets - GLB embedded derivatives		60	72
Future Contract Benefits [Member] | Carrying Value [Member]
Future contract benefits:
Indexed annuity and IUL contracts embedded derivatives		(2,585)	(1,305)
Future Contract Benefits [Member] | Fair Value [Member]
Future contract benefits:
Indexed annuity and IUL contracts embedded derivatives		(2,585)	(1,305)
Other Liabilities [Member]
Other contract holder funds:
Other liabilities - derivative liabilities		(238)
Other Liabilities [Member] | Carrying Value [Member]
Other contract holder funds:
Other liabilities - derivative liabilities	[1]	(238)	(226)
Other Liabilities [Member] | Fair Value [Member]
Other contract holder funds:
Other liabilities - derivative liabilities	[1]	(238)	(226)
Other Liabilities [Member] | GLB Ceded Embedded Derivatives [Member] | Carrying Value [Member]
Other contract holder funds:
Other liabilities - GLB embedded derivatives		(510)	(196)
Other Liabilities [Member] | GLB Ceded Embedded Derivatives [Member] | Fair Value [Member]
Other contract holder funds:
Other liabilities - GLB embedded derivatives		$ (510)	$ (196)

[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.