Fair Value of Assets and Liabilities (Financial Instruments where Carrying Amounts and Fair Values May Differ) (Details) - USD ($) $ in Millions		Mar. 31, 2020		Dec. 31, 2019		Mar. 31, 2019
Assets:
Fixed maturities, held-to-maturity	[2]	$ 1,895	[1]	$ 1,933
Assets supporting experience-rated contractholder liabilities	[2]	21,580		21,597
Commercial mortgage and other loans	[2]	63,559	[1]	63,559
Policy loans		12,099		12,096
Other invested assets	[2]	18,071	[1]	15,606
Cash and cash equivalents		31,646	[2]	16,327	[2]	$ 14,699
Accrued investment income	[2]	3,221		3,330
Liabilities:
Securities sold under agreements to repurchase		10,557		9,681
Cash collateral for loaned securities		3,396		4,213
Short-term debt		2,539		1,933
Long-term debt		20,149		18,646
Fair Value
Assets:
Fixed maturities, held-to-maturity		2,249		2,302
Assets supporting experience-rated contractholder liabilities		190		16
Commercial mortgage and other loans		64,370		65,665
Policy loans		12,099		12,096
Other invested assets		196		36
Short-term Investments		1,849		1,531
Cash and cash equivalents		10,474		7,321
Accrued investment income		3,221		3,330
Other assets		2,912		3,316
Total assets		97,560		95,613
Liabilities:
Policyholders’ account balances—investment contracts		105,330		102,156
Securities sold under agreements to repurchase		10,557		9,681
Cash collateral for loaned securities		3,396		4,213
Short-term debt		2,547		1,953
Long-term debt		20,481		21,324
Notes issued by consolidated VIEs		452		474
Other liabilities		6,853		6,982
Separate account liabilities—investment contracts		91,582		101,541
Total liabilities		241,198		248,324
Carrying Amount
Assets:
Fixed maturities, held-to-maturity		1,895		1,933
Assets supporting experience-rated contractholder liabilities		190		16
Commercial mortgage and other loans		62,889		63,331
Policy loans		12,099		12,096
Other invested assets		196		36
Short-term Investments		1,849		1,531
Cash and cash equivalents		10,474		7,321
Accrued investment income		3,221		3,330
Other assets		2,910		3,315
Total assets		95,723		92,909
Liabilities:
Policyholders’ account balances—investment contracts		104,660		101,241
Securities sold under agreements to repurchase		10,557		9,681
Cash collateral for loaned securities		3,396		4,213
Short-term debt		2,539		1,933
Long-term debt		20,149		18,646
Notes issued by consolidated VIEs		452		474
Other liabilities		6,853		6,982
Separate account liabilities—investment contracts		91,582		101,541
Total liabilities		240,188		244,711
Level 1 | Fair Value
Assets:
Fixed maturities, held-to-maturity		0		0
Assets supporting experience-rated contractholder liabilities		110		16
Commercial mortgage and other loans		0		0
Policy loans		0		0
Other invested assets		0		0
Short-term Investments		1,764		1,492
Cash and cash equivalents		10,216		6,278
Accrued investment income		0		0
Other assets		151		147
Total assets		12,241		7,933
Liabilities:
Policyholders’ account balances—investment contracts		0		0
Securities sold under agreements to repurchase		0		0
Cash collateral for loaned securities		0		0
Short-term debt		0		0
Long-term debt		1,836		1,950
Notes issued by consolidated VIEs		0		0
Other liabilities		0		0
Separate account liabilities—investment contracts		0		0
Total liabilities		1,836		1,950
Level 2 | Fair Value
Assets:
Fixed maturities, held-to-maturity		2,164		2,217
Assets supporting experience-rated contractholder liabilities		80		0
Commercial mortgage and other loans		109		107
Policy loans		0		0
Other invested assets		196		36
Short-term Investments		85		39
Cash and cash equivalents		258		1,043
Accrued investment income		3,221		3,330
Other assets		2,584		2,526
Total assets		8,697		9,298
Liabilities:
Policyholders’ account balances—investment contracts		36,747		32,940
Securities sold under agreements to repurchase		10,557		9,681
Cash collateral for loaned securities		3,396		4,213
Short-term debt		2,339		1,748
Long-term debt		17,488		18,188
Notes issued by consolidated VIEs		0		0
Other liabilities		6,806		6,403
Separate account liabilities—investment contracts		67,654		77,134
Total liabilities		144,987		150,307
Level 3 | Fair Value
Assets:
Fixed maturities, held-to-maturity		85		85
Assets supporting experience-rated contractholder liabilities		0		0
Commercial mortgage and other loans		64,261		65,558
Policy loans		12,099		12,096
Other invested assets		0		0
Short-term Investments		0		0
Cash and cash equivalents		0		0
Accrued investment income		0		0
Other assets		177		643
Total assets		76,622		78,382
Liabilities:
Policyholders’ account balances—investment contracts		68,583		69,216
Securities sold under agreements to repurchase		0		0
Cash collateral for loaned securities		0		0
Short-term debt		208		205
Long-term debt		1,157		1,186
Notes issued by consolidated VIEs		452		474
Other liabilities		47		579
Separate account liabilities—investment contracts		23,928		24,407
Total liabilities		94,375		96,067
Prudential Netting Agreement | Fair Value
Assets:
Fixed maturities, held-to-maturity		5,001		5,401
Liabilities:
Long-term debt		10,617		10,158
Prudential Netting Agreement | Carrying Amount
Assets:
Fixed maturities, held-to-maturity		4,998		4,998
Liabilities:
Long-term debt		$ 10,614		$ 9,749

[1] March 31, 2020 amounts include the impacts of the January 1, 2020 adoption of ASU 2016-13. See Note 2 for details.

[2] See Note 4 for details of balances associated with variable interest entities.