Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Other intangible assets:
Estimated Fair Value	$ 182	$ 78
Accumulated Amortization	26	17
Net Carrying Amount	156	61
Customer relationships
Other intangible assets:
Estimated Fair Value	127	42
Accumulated Amortization	12	8
Net Carrying Amount	115	34
Other
Other intangible assets:
Estimated Fair Value	55	36
Accumulated Amortization	14	9
Net Carrying Amount	$ 41	$ 27