Business Held for Sale and Discontinued Operations - Held for Sale Balance Sheets (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Investments:
Mortgage loans on real estate, allowance for credit losses	$ 74	$ 0
Premium receivable and reinsurance recoverable, allowance for credit losses	24	0
Total assets held for sale	19,923	20,069
Liabilities:
Total liabilities held for sale	18,034	18,498
Discontinued Operations, Held-for-sale | Individual Life Transaction
Investments:
Fixed maturities, available-for-sale, at fair value	12,300	11,483
Fixed maturities, at fair value using the fair value option	800	752
Mortgage loans on real estate, net of allowance for credit losses of $14 as of 2020	1,272	1,319
Mortgage loans on real estate, allowance for credit losses	14
Policy loans	996	1,005
Derivatives	258	304
Other investments	336	430
Securities pledged	2	235
Total investments	15,964	15,528
Cash and cash equivalents	413	291
Short-term investments under securities loan agreements, including collateral delivered	2	216
Premium receivable and reinsurance recoverable, net allowance for credit losses of $16 as of 2020	3,017	3,101
Premium receivable and reinsurance recoverable, allowance for credit losses	16
Deferred policy acquisition costs and Value of business acquired	392	607
Current income taxes	137	136
Deferred income taxes	(801)	(757)
Other assets	752	570
Assets held in separate accounts	1,395	1,485
Write-down of businesses held for sale to fair value less cost to sell	(1,348)	(1,108)
Total assets held for sale	19,923	20,069
Liabilities:
Future policy benefits and contract owner account balances	15,455	15,472
Payables under securities loan and repurchase agreements, including collateral held	162	428
Derivatives	69	77
Notes payable	219	252
Other liabilities	734	784
Liabilities related to separate accounts	1,395	1,485
Total liabilities held for sale	$ 18,034	$ 18,498