Reinsurance (Effects of Reinsurance on Balance Sheet) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Assets
Premiums, reinsurance and other receivables (net of allowance for credit losses of $10 and $10, respectively)	$ 15,649	$ 15,721
Liabilities:
Liability for Future Policy Benefit, after Reinsurance	43,589	44,266
Policyholder account balances	66,195	53,946
Other Policyholder Funds	3,153	3,114
Other liabilities	3,850	4,210
Direct
Assets
Premiums, reinsurance and other receivables (net of allowance for credit losses of $10 and $10, respectively)	434	519
Liabilities:
Liability for Future Policy Benefit, after Reinsurance	43,346	44,027
Policyholder account balances	62,080	50,292
Other Policyholder Funds	1,500	1,416
Other liabilities	2,618	3,066
Assumed index-linked annuities
Assets
Premiums, reinsurance and other receivables (net of allowance for credit losses of $10 and $10, respectively)	17	30
Liabilities:
Liability for Future Policy Benefit, after Reinsurance	243	239
Policyholder account balances	4,115	3,654
Other Policyholder Funds	1,653	1,698
Other liabilities	58	40
Ceded Reinsurance
Assets
Premiums, reinsurance and other receivables (net of allowance for credit losses of $10 and $10, respectively)	15,198	15,172
Liabilities:
Liability for Future Policy Benefit, after Reinsurance	0	0
Policyholder account balances	0	0
Other Policyholder Funds	0	0
Other liabilities	$ 1,174	$ 1,104