Fair Value of Financial Instruments (Carrying and Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Millions		Jun. 30, 2019	Dec. 31, 2018
Assets
Fixed maturity AFS securities		$ 99,733	$ 94,024
Trading securities		4,522	1,950
Equity securities		196	99
Mortgage loans on real estate		15,090	13,260
Derivative investments		1,510	1,107
Other investments		2,845	2,267
Carrying Value [Member]
Assets
Trading securities		4,522	1,950
Equity securities		196	99
Mortgage loans on real estate		15,090	13,260
Derivative investments	[1]	1,510	1,107
Other investments		2,833	2,255
Cash and invested cash		3,314	2,345
Separate account assets		146,275	132,833
Future contract benefits:
Indexed annuity and IUL contracts embedded derivatives		(1,973)	(1,305)
Other contract holder funds:
Remaining guaranteed interest and similar contracts		(1,973)	(542)
Account values of certain investment contracts		(36,691)	(34,535)
Short-term debt		(300)
Long-term debt		(5,621)	(5,839)
Reinsurance related embedded derivatives		(310)	(3)
Fair Value [Member]
Assets
Trading securities		4,522	1,950
Equity securities		196	99
Mortgage loans on real estate		15,426	13,092
Derivative investments	[1]	1,510	1,107
Other investments		2,833	2,255
Cash and invested cash		3,314	2,345
Separate account assets		146,275	132,833
Future contract benefits:
Indexed annuity and IUL contracts embedded derivatives		(1,973)	(1,305)
Other contract holder funds:
Remaining guaranteed interest and similar contracts		(1,973)	(542)
Account values of certain investment contracts		(44,704)	(36,358)
Short-term debt		(306)
Long-term debt		(5,626)	(5,604)
Reinsurance related embedded derivatives		(310)	(3)
Fixed Maturity AFS Securities [Member] | Carrying Value [Member]
Assets
Fixed maturity AFS securities		99,733	94,024
Fixed Maturity AFS Securities [Member] | Fair Value [Member]
Assets
Fixed maturity AFS securities		99,733	94,024
Other Assets [Member] | Carrying Value [Member]
Assets
Other assets - GLB direct embedded derivatives			123
Other assets - GLB ceded embedded derivatives		111	72
Indexed annuity ceded embedded derivatives		903	902
Other Assets [Member] | Fair Value [Member]
Assets
Other assets - GLB direct embedded derivatives			123
Other assets - GLB ceded embedded derivatives		111	72
Indexed annuity ceded embedded derivatives		903	902
Other Liabilities [Member] | Carrying Value [Member]
Other contract holder funds:
Other liabilities - derivative liabilities	[1]	(358)	(160)
Other liabilities - GLB embedded derivatives		(1)
Other Liabilities [Member] | Fair Value [Member]
Other contract holder funds:
Other liabilities - derivative liabilities	[1]	(358)	$ (160)
Other liabilities - GLB embedded derivatives		$ (1)

[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.