Fair Value of Financial Instruments (Carrying and Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Assets
Fixed maturity AFS securities	$ 120,452	$ 121,111
Trading securities	4,175	4,442
Equity securities	170	127
Mortgage loans on real estate	17,487	16,681
Derivative investments	4,547	3,109
Other investments	3,223	3,025
Carrying Value [Member]
Assets
Trading securities	4,175	4,442
Equity securities	170	127
Mortgage loans on real estate	17,487	16,681
Derivative investments	4,547	3,109
Other investments	3,212	3,015
Cash and invested cash	1,914	1,462
Indexed annuity ceded embedded derivatives	515	550
Separate account assets	178,795	167,965
Future contract benefits:
Indexed annuity and IUL contracts embedded derivatives	(4,937)	(3,594)
Other contract holder funds:
Remaining guaranteed interest and similar contracts	(1,835)	(1,854)
Account values of certain investment contracts	(40,540)	(40,917)
Short-term debt	(457)	(497)
Long-term debt	(2,332)	(2,412)
Reinsurance related embedded derivatives	(729)	(540)
Other liabilities - derivative liabilities	(249)	(353)
Fair Value [Member]
Assets
Trading securities	4,175	4,442
Equity securities	170	127
Mortgage loans on real estate	18,535	18,129
Derivative investments	4,547	3,109
Other investments	3,212	3,015
Cash and invested cash	1,914	1,462
Indexed annuity ceded embedded derivatives	515	550
Separate account assets	178,795	167,965
Future contract benefits:
Indexed annuity and IUL contracts embedded derivatives	(4,937)	(3,594)
Other contract holder funds:
Remaining guaranteed interest and similar contracts	(1,835)	(1,854)
Account values of certain investment contracts	(45,258)	(49,709)
Short-term debt	(457)	(497)
Long-term debt	(2,670)	(2,834)
Reinsurance related embedded derivatives	(729)	(540)
Other liabilities - derivative liabilities	(249)	(353)
Fixed Maturity AFS Securities [Member] | Carrying Value [Member]
Assets
Fixed maturity AFS securities	120,452	121,111
Fixed Maturity AFS Securities [Member] | Fair Value [Member]
Assets
Fixed maturity AFS securities	120,452	121,111
GLB Direct Embedded Derivatives [Member] | Carrying Value [Member]
Assets
Other assets - GLB embedded derivatives	1,767	450
GLB Direct Embedded Derivatives [Member] | Fair Value [Member]
Assets
Other assets - GLB embedded derivatives	1,767	450
GLB Ceded Embedded Derivatives [Member] | Carrying Value [Member]
Assets
Other assets - GLB embedded derivatives	53	82
Other contract holder funds:
Other liabilities - GLB embedded derivatives	(1,816)	(531)
GLB Ceded Embedded Derivatives [Member] | Fair Value [Member]
Assets
Other assets - GLB embedded derivatives	53	82
Other contract holder funds:
Other liabilities - GLB embedded derivatives	(1,816)	$ (531)
LPR Ceded Derivative [Member] | Carrying Value [Member]
Assets
Other assets - GLB embedded derivatives	294
LPR Ceded Derivative [Member] | Fair Value [Member]
Assets
Other assets - GLB embedded derivatives	$ 294