Related Party Transactions (Effects of Affiliated Reinsurance on Balance Sheets) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Assets
Premiums, reinsurance and other receivables	$ 23,049	$ 22,435
Deferred policy acquisition costs and value of business acquired	2,798	3,453
Liabilities:
Policyholder account balances	96,989	91,708
Other policy-related balances	7,691	7,732
Other Liabilities	27,256	26,082
Assumed Reinsurance [Member] | Affiliated Entity
Assets
Premiums, reinsurance and other receivables	1	0
Deferred policy acquisition costs and value of business acquired	0	0
Total assets	1	0
Liabilities:
Liability for Future Policy Benefit, before Reinsurance	51	55
Policyholder account balances	125	131
Other policy-related balances	1	1
Other Liabilities	860	824
Total liabilities	1,037	1,011
Ceded Reinsurance [Member] | Affiliated Entity
Assets
Premiums, reinsurance and other receivables	12,495	12,584
Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Ceded	(149)	(160)
Total assets	12,346	12,424
Liabilities:
Liability for Future Policy Benefit, before Reinsurance, Ceded	(15)	(6)
Policyholder account balances	0	0
Other policy-related balances	5	9
Other Liabilities	12,876	12,695
Total liabilities	$ 12,866	$ 12,698