Business Held for Sale and Discontinued Operations - Held for Sale Balance Sheets (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Investments:
Fixed maturities, allowance for credit losses	$ 16	$ 0
Premium receivable and reinsurance recoverable, allowance for credit losses	19	0
Total assets held for sale	20,180	20,069
Liabilities:
Total liabilities held for sale	18,232	18,498
Discontinued Operations, Held-for-sale | Individual Life Transaction
Investments:
Fixed maturities, available-for-sale, at fair value	12,779	11,483
Fixed maturities, at fair value using the fair value option	774	752
Mortgage loans on real estate, net of allowance for credit losses of $12 as of 2020	1,264	1,319
Fixed maturities, allowance for credit losses	12
Policy loans	996	1,005
Derivatives	314	304
Other investments	337	430
Securities pledged	2	235
Total investments	16,466	15,528
Cash and cash equivalents	497	291
Short-term investments under securities loan agreements, including collateral delivered	2	216
Premium receivable and reinsurance recoverable, net allowance for credit losses of $15 as of 2020	2,838	3,101
Premium receivable and reinsurance recoverable, allowance for credit losses	15
Deferred policy acquisition costs and Value of business acquired	372	607
Current income taxes	0	136
Deferred income taxes	(794)	(757)
Other assets	665	570
Assets held in separate accounts	1,473	1,485
Write-down of businesses held for sale to fair value less cost to sell	(1,339)	(1,108)
Total assets held for sale	20,180	20,069
Liabilities:
Future policy benefits and contract owner account balances	15,505	15,472
Payables under securities loan and repurchase agreements, including collateral held	209	428
Derivatives	86	77
Notes payable	219	252
Other liabilities	740	784
Liabilities related to separate accounts	1,473	1,485
Total liabilities held for sale	$ 18,232	$ 18,498