Fair Values of Assets and Liabilities (Recurring) (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
		Mar. 31, 2020	Jun. 30, 2020		Dec. 31, 2019
Assets
Available-for-Sale securities			$ 21,587		$ 20,902
Separate account assets at NAV			79,059		82,425
Liabilities
Individual contracts in a liability position	[1]		7,649		5,168
Individual contracts in an asset position	[2]		5,711		4,283
Cumulative increase (decrease) in embedded derivatives of adjustment for nonperformance risk		$ (502)	(1,200)
GMWB and GMAB embedded derivatives [Member]
Liabilities
Individual contracts in a liability position			3,200		981
Individual contracts in an asset position			25		218
Recurring basis [Member]
Assets
Available-for-Sale securities			21,587		20,902
Cash equivalents			4,014		1,256
Other assets			5,711		4,283
Separate account assets at NAV	[3]		79,059		82,425
Total assets at fair value			110,371		108,866
Liabilities
Policyholder account balances, future policy benefits and claims			4,064	[4]	1,690	[5]
Other liabilities			3,585		3,478
Total liabilities at fair value			7,649		5,168
Recurring basis [Member] | Interest rate derivative contracts [Member]
Assets
Other assets			3,096		1,451
Liabilities
Other liabilities			1,031		418
Recurring basis [Member] | Equity derivative contracts [Member]
Assets
Other assets			2,583		2,812
Liabilities
Other liabilities			2,531		3,054
Recurring basis [Member] | Foreign exchange derivative contracts [Member]
Assets
Other assets			32		16
Liabilities
Other liabilities			13		6
Recurring basis [Member] | Credit derivative contracts [Member]
Assets
Other assets					4
Liabilities
Other liabilities			10
Recurring basis [Member] | Fixed deferred indexed annuity embedded derivatives [Member]
Liabilities
Policyholder account balances, future policy benefits and claims			44		46
Recurring basis [Member] | IUL embedded derivatives [Member]
Liabilities
Policyholder account balances, future policy benefits and claims			882		881
Recurring basis [Member] | GMWB and GMAB embedded derivatives [Member]
Liabilities
Policyholder account balances, future policy benefits and claims			3,129	[6]	763	[7]
Recurring basis [Member] | Structured annuity embedded derivatives [Member]
Liabilities
Policyholder account balances, future policy benefits and claims			9
Recurring basis [Member] | Corporate debt securities [Member]
Assets
Available-for-Sale securities			11,317		11,522
Recurring basis [Member] | Residential mortgage backed securities [Member]
Assets
Available-for-Sale securities			3,335		3,108
Recurring basis [Member] | Commercial mortgage backed securities [Member]
Assets
Available-for-Sale securities			3,978		3,618
Recurring basis [Member] | State and municipal obligations [Member]
Assets
Available-for-Sale securities			1,320		1,306
Recurring basis [Member] | Asset backed securities [Member]
Assets
Available-for-Sale securities			1,375		1,080
Recurring basis [Member] | Foreign government bonds and obligations [Member]
Assets
Available-for-Sale securities			261		267
Recurring basis [Member] | U.S. government and agencies obligations [Member]
Assets
Available-for-Sale securities			1		1
Level 1 [Member] | Recurring basis [Member]
Assets
Available-for-Sale securities			1		1
Cash equivalents			2,950
Other assets			387		163
Total assets at fair value			3,338		164
Liabilities
Other liabilities			185		37
Total liabilities at fair value			185		37
Level 1 [Member] | Recurring basis [Member] | Equity derivative contracts [Member]
Assets
Other assets			386		162
Liabilities
Other liabilities			182		36
Level 1 [Member] | Recurring basis [Member] | Foreign exchange derivative contracts [Member]
Assets
Other assets			1		1
Liabilities
Other liabilities			3		1
Level 1 [Member] | Recurring basis [Member] | U.S. government and agencies obligations [Member]
Assets
Available-for-Sale securities			1		1
Level 2 [Member] | Recurring basis [Member]
Assets
Available-for-Sale securities			20,447		19,760
Cash equivalents			1,064		1,256
Other assets			5,324		4,120
Total assets at fair value			26,835		25,136
Liabilities
Policyholder account balances, future policy benefits and claims			3		3
Other liabilities			3,400		3,441
Total liabilities at fair value			3,403		3,444
Level 2 [Member] | Recurring basis [Member] | Interest rate derivative contracts [Member]
Assets
Other assets			3,096		1,451
Liabilities
Other liabilities			1,031		418
Level 2 [Member] | Recurring basis [Member] | Equity derivative contracts [Member]
Assets
Other assets			2,197		2,650
Liabilities
Other liabilities			2,349		3,018
Level 2 [Member] | Recurring basis [Member] | Foreign exchange derivative contracts [Member]
Assets
Other assets			31		15
Liabilities
Other liabilities			10		5
Level 2 [Member] | Recurring basis [Member] | Credit derivative contracts [Member]
Assets
Other assets					4
Liabilities
Other liabilities			10
Level 2 [Member] | Recurring basis [Member] | Fixed deferred indexed annuity embedded derivatives [Member]
Liabilities
Policyholder account balances, future policy benefits and claims			3		3
Level 2 [Member] | Recurring basis [Member] | Corporate debt securities [Member]
Assets
Available-for-Sale securities			10,586		10,787
Level 2 [Member] | Recurring basis [Member] | Residential mortgage backed securities [Member]
Assets
Available-for-Sale securities			3,279		3,091
Level 2 [Member] | Recurring basis [Member] | Commercial mortgage backed securities [Member]
Assets
Available-for-Sale securities			3,978		3,618
Level 2 [Member] | Recurring basis [Member] | State and municipal obligations [Member]
Assets
Available-for-Sale securities			1,320		1,306
Level 2 [Member] | Recurring basis [Member] | Asset backed securities [Member]
Assets
Available-for-Sale securities			1,023		691
Level 2 [Member] | Recurring basis [Member] | Foreign government bonds and obligations [Member]
Assets
Available-for-Sale securities			261		267
Level 3 [Member] | Recurring basis [Member]
Assets
Available-for-Sale securities			1,139		1,141
Total assets at fair value			1,139		1,141
Liabilities
Policyholder account balances, future policy benefits and claims			4,061		1,687
Total liabilities at fair value			4,061		1,687
Level 3 [Member] | Recurring basis [Member] | Fixed deferred indexed annuity embedded derivatives [Member]
Liabilities
Policyholder account balances, future policy benefits and claims			41		43
Level 3 [Member] | Recurring basis [Member] | IUL embedded derivatives [Member]
Liabilities
Policyholder account balances, future policy benefits and claims			882		881
Level 3 [Member] | Recurring basis [Member] | GMWB and GMAB embedded derivatives [Member]
Liabilities
Policyholder account balances, future policy benefits and claims			3,129		763
Level 3 [Member] | Recurring basis [Member] | Structured annuity embedded derivatives [Member]
Liabilities
Policyholder account balances, future policy benefits and claims			9
Level 3 [Member] | Recurring basis [Member] | Corporate debt securities [Member]
Assets
Available-for-Sale securities			731		735
Level 3 [Member] | Recurring basis [Member] | Residential mortgage backed securities [Member]
Assets
Available-for-Sale securities			56		17
Level 3 [Member] | Recurring basis [Member] | Asset backed securities [Member]
Assets
Available-for-Sale securities			$ 352		$ 389

[1] The fair value of freestanding derivative liabilities is included in Other liabilities on the Consolidated Balance Sheets. The fair value of GMWB and GMAB, IUL, indexed annuity and structured variable annuity embedded derivatives is included in Policyholder account balances, future policy benefits and claims on the Consolidated Balance Sheets.

[2] The fair value of freestanding derivative assets is included in Other assets on the Consolidated Balance Sheets.

[3] Amounts are comprised of certain financial instruments that are measured at fair value using the NAV per share (or its equivalent) as a practical expedient and have not been classified in the fair value hierarchy.

[4] The Company’s adjustment for nonperformance risk resulted in a $(1.2) billion cumulative increase (decrease) to the embedded derivatives as of June 30, 2020.

[5] The Company’s adjustment for nonperformance risk resulted in a $(502) million cumulative increase (decrease) to the embedded derivatives as of December 31, 2019.

[6] The fair value of the GMWB and GMAB embedded derivatives included $3.2 billion of individual contracts in a liability position and $25 million of individual contracts in an asset position as of June 30, 2020.

[7] The fair value of the GMWB and GMAB embedded derivatives included $981 million of individual contracts in a liability position and $218 million of individual contracts in an asset position as of December 31, 2019.