Goodwill and Other Intangible Assets (Details) - Other Intangible Assets - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Other intangible assets by major asset class
Intangible assets subject to amortization, gross carrying amount	$ 301	$ 309
Intangible assets subject to amortization, accumulated amortization	233	229
Intangible assets subject to amortization, net	68	80
Intangible assets not subject to amortization	226	226
Total other intangible assets, gross carrying amount	527	535
Total other intangible assets, net	294	306
Customer-related [Member]
Other intangible assets by major asset class
Intangible assets subject to amortization, gross carrying amount	96	104
Intangible assets subject to amortization, accumulated amortization	43	41
Intangible assets subject to amortization, net	53	63
Contract-based [Member]
Other intangible assets by major asset class
Intangible assets subject to amortization, gross carrying amount	205	205
Intangible assets subject to amortization, accumulated amortization	190	188
Intangible assets subject to amortization, net	$ 15	$ 17