Fair Value of Financial Instruments (Carrying and Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Millions		Sep. 30, 2019	Dec. 31, 2018
Assets
Fixed maturity AFS securities		$ 103,659	$ 94,024
Trading securities		4,691	1,950
Equity securities		158	99
Mortgage loans on real estate		15,947	13,260
Derivative investments		2,201	1,107
Other investments		3,389	2,267
Carrying Value [Member]
Assets
Trading securities		4,691	1,950
Equity securities		158	99
Mortgage loans on real estate		15,947	13,260
Derivative investments	[1]	2,201	1,107
Other investments		3,377	2,255
Cash and invested cash		2,939	2,345
Separate account assets		145,092	132,833
Future contract benefits:
Indexed annuity and IUL contracts embedded derivatives		(2,098)	(1,305)
Other contract holder funds:
Remaining guaranteed interest and similar contracts		(1,947)	(542)
Account values of certain investment contracts		(37,508)	(34,535)
Short-term debt		(300)
Long-term debt		(6,070)	(5,839)
Reinsurance related embedded derivatives		(339)	(3)
Fair Value [Member]
Assets
Trading securities		4,691	1,950
Equity securities		158	99
Mortgage loans on real estate		16,757	13,092
Derivative investments	[1]	2,201	1,107
Other investments		3,377	2,255
Cash and invested cash		2,939	2,345
Separate account assets		145,092	132,833
Future contract benefits:
Indexed annuity and IUL contracts embedded derivatives		(2,098)	(1,305)
Other contract holder funds:
Remaining guaranteed interest and similar contracts		(1,947)	(542)
Account values of certain investment contracts		(47,276)	(36,358)
Short-term debt		(304)
Long-term debt		(6,047)	(5,604)
Reinsurance related embedded derivatives		(339)	(3)
Fixed Maturity AFS Securities [Member] | Carrying Value [Member]
Assets
Fixed maturity AFS securities		103,659	94,024
Fixed Maturity AFS Securities [Member] | Fair Value [Member]
Assets
Fixed maturity AFS securities		103,659	94,024
Other Assets [Member] | Carrying Value [Member]
Assets
Other assets - GLB direct embedded derivatives			123
Other assets - GLB ceded embedded derivatives		241	72
Indexed annuity ceded embedded derivatives		891	902
Other Assets [Member] | Fair Value [Member]
Assets
Other assets - GLB direct embedded derivatives			123
Other assets - GLB ceded embedded derivatives		241	72
Indexed annuity ceded embedded derivatives		891	902
Other Liabilities [Member] | Carrying Value [Member]
Other contract holder funds:
Other liabilities - derivative liabilities	[1]	(584)	(160)
Other liabilities - GLB embedded derivatives		(846)
Other Liabilities [Member] | Fair Value [Member]
Other contract holder funds:
Other liabilities - derivative liabilities	[1]	(584)	$ (160)
Other liabilities - GLB embedded derivatives		$ (846)

[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.