Goodwill and Other Intangible Assets (Details) - Other Intangible Assets - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Other intangible assets by major asset class
Intangible assets subject to amortization, gross carrying amount	$ 304	$ 300
Intangible assets subject to amortization, accumulated amortization	247	239
Intangible assets subject to amortization, net	57	61
Intangible assets not subject to amortization	226	226
Total other intangible assets, gross carrying amount	530	526
Total other intangible assets, net	283	287
Customer-related [Member]
Other intangible assets by major asset class
Intangible assets subject to amortization, gross carrying amount	99	96
Intangible assets subject to amortization, accumulated amortization	54	48
Intangible assets subject to amortization, net	45	48
Contract-based [Member]
Other intangible assets by major asset class
Intangible assets subject to amortization, gross carrying amount	205	204
Intangible assets subject to amortization, accumulated amortization	193	191
Intangible assets subject to amortization, net	$ 12	$ 13