Goodwill and Other Intangible Assets (Details) - Other Intangible Assets - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Other intangible assets by major asset class
Intangible assets subject to amortization, gross carrying amount	$ 301	$ 300
Intangible assets subject to amortization, accumulated amortization	242	239
Intangible assets subject to amortization, net	59	61
Intangible assets not subject to amortization	226	226
Total other intangible assets, gross carrying amount	527	526
Total other intangible assets, net	285	287
Customer-related [Member]
Other intangible assets by major asset class
Intangible assets subject to amortization, gross carrying amount	97	96
Intangible assets subject to amortization, accumulated amortization	50	48
Intangible assets subject to amortization, net	47	48
Contract-based [Member]
Other intangible assets by major asset class
Intangible assets subject to amortization, gross carrying amount	204	204
Intangible assets subject to amortization, accumulated amortization	192	191
Intangible assets subject to amortization, net	$ 12	$ 13