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Fair Value of Financial Instruments (Carrying and Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Assets
Fixed maturity AFS securities	$ 123,044	$ 105,200
Trading securities	4,501	4,673
Equity securities	129	103
Mortgage loans on real estate	16,763	16,339
Derivative investments	3,109	1,911
Other investments	3,984	2,994
Other contract holder funds:
Benefit Plans' Assets	1,736	1,589
Carrying Value [Member]
Assets
Trading securities	4,501	4,673
Equity securities	129	103
Mortgage loans on real estate	16,763	16,339
Derivative investments	3,109	1,911
Other investments	3,974	2,983
Cash and invested cash	1,708	2,563
Other assets - GLB embedded derivatives	450	450
Other assets - GLB ceded embedded derivatives	82	60
Indexed annuity ceded embedded derivatives	550	927
Separate account assets	167,965	153,566
Other contract holder funds:
Remaining guaranteed interest and similar contracts	(1,854)	(1,900)
Account values of certain investment contracts	(40,947)	(38,639)
Short-term debt		(300)
Long-term debt	(6,682)	(6,067)
Reinsurance related embedded derivatives	(392)	(327)
Benefit Plans' Assets	1,736	1,589
Fair Value [Member]
Assets
Trading securities	4,501	4,673
Equity securities	129	103
Mortgage loans on real estate	18,219	16,872
Derivative investments	3,109	1,911
Other investments	3,974	2,983
Cash and invested cash	1,708	2,563
Other assets - GLB embedded derivatives	450	450
Other assets - GLB ceded embedded derivatives	82	60
Indexed annuity ceded embedded derivatives	550	927
Separate account assets	167,965	153,566
Other contract holder funds:
Remaining guaranteed interest and similar contracts	(1,854)	(1,900)
Account values of certain investment contracts	(49,745)	(46,822)
Short-term debt		(304)
Long-term debt	(7,067)	(6,217)
Reinsurance related embedded derivatives	(392)	(327)
Benefit Plans' Assets	1,736	1,589
Fixed Maturity AFS Securities [Member] | Carrying Value [Member]
Assets
Fixed maturity AFS securities	123,044	105,200
Fixed Maturity AFS Securities [Member] | Fair Value [Member]
Assets
Fixed maturity AFS securities	123,044	105,200
Future Contract Benefits [Member] | Carrying Value [Member]
Future contract benefits:
Indexed annuity and IUL contracts embedded derivatives	(3,594)	(2,585)
Future Contract Benefits [Member] | Fair Value [Member]
Future contract benefits:
Indexed annuity and IUL contracts embedded derivatives	(3,594)	(2,585)
Other Liabilities [Member] | Carrying Value [Member]
Other contract holder funds:
Other liabilities - derivative liabilities	(906)	(349)
Other Liabilities [Member] | Fair Value [Member]
Other contract holder funds:
Other liabilities - derivative liabilities	$ (906)	(349)
Other Liabilities [Member] | GLB Ceded Embedded Derivatives [Member] | Carrying Value [Member]
Other contract holder funds:
Other liabilities - GLB embedded derivatives		(9)
Other Liabilities [Member] | GLB Ceded Embedded Derivatives [Member] | Fair Value [Member]
Other contract holder funds:
Other liabilities - GLB embedded derivatives		$ (9)

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