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	$ 116,372	$ 103,773
Trading securities	4,574	4,602
Equity securities	120	103
Mortgage loans	16,458	16,244
Derivative investments	3,235	1,911
Other investments	2,986	2,565
Carrying Value [Member]
Assets
Trading securities	4,574	4,602
Equity securities	120	103
Mortgage loans	16,458	16,244
Derivative investments	3,235	1,911
Other investments	2,976	2,554
Cash and invested cash	1,711	1,879
Indexed annuity ceded embedded derivatives	536	927
Separate account assets	152,975	153,571
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	(40,437)	(38,606)
Short-term debt	(466)	(609)
Long-term debt	(2,409)	(2,414)
Reinsurance related embedded derivatives	(476)	(375)
Other liabilities - derivative liabilities	(331)	(238)
Fair Value [Member]
Assets
Trading securities	4,574	4,602
Equity securities	120	103
Mortgage loans	18,145	16,774
Derivative investments	3,235	1,911
Other investments	2,976	2,554
Cash and invested cash	1,711	1,879
Indexed annuity ceded embedded derivatives	536	927
Separate account assets	152,975	153,571
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	(56,321)	(46,781)
Short-term debt	(466)	(609)
Long-term debt	(2,736)	(2,714)
Reinsurance related embedded derivatives	(476)	(375)
Other liabilities - derivative liabilities	(331)	(238)
Fixed Maturity AFS Securities [Member] | Carrying Value [Member]
Assets
Fixed maturity AFS securities	116,372	103,773
Fixed Maturity AFS Securities [Member] | Fair Value [Member]
Assets
Fixed maturity AFS securities	116,372	103,773
GLB Direct Embedded Derivatives [Member] | Carrying Value [Member]
Assets
Other assets - GLB embedded derivatives		450
Other contract holder funds:
Other liabilities - GLB embedded derivatives	(1,106)
GLB Direct Embedded Derivatives [Member] | Fair Value [Member]
Assets
Other assets - GLB embedded derivatives		450
Other contract holder funds:
Other liabilities - GLB embedded derivatives	(1,106)
GLB Ceded Embedded Derivatives [Member] | Carrying Value [Member]
Assets
Other assets - GLB embedded derivatives	1,105	60
Other contract holder funds:
Other liabilities - GLB embedded derivatives		(510)
GLB Ceded Embedded Derivatives [Member] | Fair Value [Member]
Assets
Other assets - GLB embedded derivatives	$ 1,105	60
Other contract holder funds:
Other liabilities - GLB embedded derivatives		$ (510)