Other Assets (Intangible Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization	$ (128)	$ (109)
Total intangible assets, gross	207	207
Net intangible assets	79	98
Remainder of 2023	7
2024	19
2025	14
2026	14
2027	14
Technology
Finite-Lived Intangible Assets [Line Items]
Gross intangible assets	122	122
Accumulated amortization	(65)	(53)
Net carrying value	57	69
Customer lists
Finite-Lived Intangible Assets [Line Items]
Gross intangible assets	58	58
Accumulated amortization	(55)	(51)
Net carrying value	3	7
Purchased credit card relationships
Finite-Lived Intangible Assets [Line Items]
Gross intangible assets	25	25
Accumulated amortization	(6)	(4)
Net carrying value	19	21
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross intangible assets	2	2
Accumulated amortization	(2)	(1)
Net carrying value	$ 0	$ 1