Financial Derivative Instruments and Risk Management - Net of Tax Impact of the Overall Effectiveness of Derivative Instruments Designated as Cash Flow Hedging Instruments (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Derivatives designated as cash flow hedges
Amortization of swaption cash flow hedges, net of tax	$ 1		$ 1
Unrealized gain from cash flows hedges, net of tax	2	$ (7)	(1)
Total	3		0	$ (4)	$ 0
Interest Rate Swap
Derivatives designated as cash flow hedges
Amortization of swaption cash flow hedges, net of tax	1		1	1	1
Unrealized gain from cash flows hedges, net of tax	2		(1)	(5)	(1)
Total	3		0	(4)	0
Interest Rate Swap | Cash Flow Hedging
Derivatives designated as cash flow hedges
Amortization of cash flow hedges, net of tax	$ (1)		$ (1)	$ (1)	$ (1)