Business Held for Sale and Discontinued Operations - Held for Sale Balance Sheets (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Investments:
Mortgage loans on real estate, allowance for credit losses	$ 22	$ 0
Premium receivable and reinsurance recoverable, allowance for credit losses	22	0
Total assets held for sale	19,133	20,069
Liabilities:
Total liabilities held for sale	17,972	18,498
Discontinued Operations, Held-for-sale | Individual Life Transaction
Investments:
Fixed maturities, available-for-sale, at fair value	11,097	11,483
Fixed maturities, at fair value using the fair value option	747	752
Mortgage loans on real estate, net of allowance for credit losses of $3 as of 2020	1,306	1,319
Mortgage loans on real estate, allowance for credit losses	3
Policy loans	1,006	1,005
Derivatives	148	304
Other investments	423	430
Securities pledged	209	235
Total investments	14,936	15,528
Cash and cash equivalents	279	291
Short-term investments under securities loan agreements, including collateral delivered	191	216
Premium receivable and reinsurance recoverable, net allowance for credit losses of $13 as of 2020	3,102	3,101
Premium receivable and reinsurance recoverable, allowance for credit losses	13
Deferred policy acquisition costs and Value of business acquired	771	607
Current income taxes	136	136
Deferred income taxes	(664)	(757)
Other assets	441	570
Assets held in separate accounts	1,212	1,485
Write-down of businesses held for sale to fair value less cost to sell	(1,271)	(1,108)
Total assets held for sale	19,133	20,069
Liabilities:
Future policy benefits and contract owner account balances	15,389	15,472
Payables under securities loan and repurchase agreements, including collateral held	265	428
Derivatives	58	77
Notes payable	252	252
Other liabilities	796	784
Liabilities related to separate accounts	1,212	1,485
Total liabilities held for sale	$ 17,972	$ 18,498