Fair Value of Financial Instruments (Carrying and Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Assets
Fixed maturity AFS securities	$ 118,252	$ 105,200
Trading securities	4,633	4,673
Equity securities	122	103
Mortgage loans on real estate	16,541	16,339
Derivative investments	3,236	1,911
Other investments	4,204	2,994
Carrying Value [Member]
Assets
Trading securities	4,633	4,673
Equity securities	122	103
Mortgage loans on real estate	16,541	16,339
Derivative investments	3,236	1,911
Other investments	4,194	2,983
Cash and invested cash	2,595	2,563
Separate account assets	152,975	153,566
Future contract benefits:
Indexed annuity and IUL contracts embedded derivatives	(2,688)	(2,585)
Other contract holder funds:
Remaining guaranteed interest and similar contracts	(1,860)	(1,900)
Account values of certain investment contracts	(40,468)	(38,639)
Short-term debt		(300)
Long-term debt	(6,714)	(6,067)
Reinsurance related embedded derivatives	(334)	(327)
Fair Value [Member]
Assets
Trading securities	4,633	4,673
Equity securities	122	103
Mortgage loans on real estate	18,238	16,872
Derivative investments	3,236	1,911
Other investments	4,194	2,983
Cash and invested cash	2,595	2,563
Separate account assets	152,975	153,566
Future contract benefits:
Indexed annuity and IUL contracts embedded derivatives	(2,688)	(2,585)
Other contract holder funds:
Remaining guaranteed interest and similar contracts	(1,860)	(1,900)
Account values of certain investment contracts	(56,360)	(46,822)
Short-term debt		(304)
Long-term debt	(6,740)	(6,217)
Reinsurance related embedded derivatives	(334)	(327)
Fixed Maturity AFS Securities [Member] | Carrying Value [Member]
Assets
Fixed maturity AFS securities	118,252	105,200
Fixed Maturity AFS Securities [Member] | Fair Value [Member]
Assets
Fixed maturity AFS securities	118,252	105,200
Other Assets [Member] | Carrying Value [Member]
Assets
Indexed annuity ceded embedded derivatives	536	927
Other Assets [Member] | Fair Value [Member]
Assets
Indexed annuity ceded embedded derivatives	536	927
Other Assets [Member] | GLB Direct Embedded Derivatives [Member] | Carrying Value [Member]
Assets
Other assets - GLB embedded derivatives		450
Other Assets [Member] | GLB Direct Embedded Derivatives [Member] | Fair Value [Member]
Assets
Other assets - GLB embedded derivatives		450
Other Assets [Member] | GLB Ceded Embedded Derivatives [Member] | Carrying Value [Member]
Assets
Other assets - GLB embedded derivatives	281	60
Other Assets [Member] | GLB Ceded Embedded Derivatives [Member] | Fair Value [Member]
Assets
Other assets - GLB embedded derivatives	281	60
Other Liabilities [Member] | Carrying Value [Member]
Other contract holder funds:
Other liabilities - derivative liabilities	(1,067)	(349)
Other Liabilities [Member] | Fair Value [Member]
Other contract holder funds:
Other liabilities - derivative liabilities	(1,067)	(349)
Other Liabilities [Member] | GLB Direct Embedded Derivatives [Member] | Carrying Value [Member]
Other contract holder funds:
Other liabilities - GLB embedded derivatives	(1,106)
Other Liabilities [Member] | GLB Direct Embedded Derivatives [Member] | Fair Value [Member]
Other contract holder funds:
Other liabilities - GLB embedded derivatives	$ (1,106)
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)