Derivative Financial Instruments - Gross and net amounts for OTC derivatives (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Asset derivatives
Gross amount	$ 106	$ 121
Counter-party netting	0	(14)
Net amount on balance sheet	106	107
Liability derivatives
Gross amount	(27)	(12)
Counter-party netting	10	8
Net amount on balance sheet	(17)	(4)
OTC derivatives
Asset derivatives
Gross amount	10	23
Counter-party netting	(10)	(22)
Cash collateral (received) pledged	0	0
Net amount on balance sheet	0	1
Securities collateral (received) pledged	0	0
Net amount	0	1
Liability derivatives
Gross amount	(20)	(22)
Counter-party netting	10	22
Cash collateral (received) pledged	8	(1)
Net amount on balance sheet	(2)	(1)
Securities collateral (received) pledged	0	0
Net amount	$ (2)	$ (1)