Goodwill and Other Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 2,708	$ 3,673
Accumulated Amortization and Impairment	2,043	2,890
Total	665	783
Estimated amortization for intangible assets
Remainder of 2020	40
2021	140
2022	100
2023	88
2024	71
2025	52
Thereafter	174
Total	665	783
Customer-related and contract-based
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,273	2,264
Accumulated Amortization and Impairment	1,690	1,600
Total	583	664
Estimated amortization for intangible assets
Total	583	664
Tradenames
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	14	1,029
Accumulated Amortization and Impairment	12	956
Total	2	73
Impairment of intangible assets	1,000
Estimated amortization for intangible assets
Total	2	73
Technology and other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	421	380
Accumulated Amortization and Impairment	341	334
Total	80	46
Estimated amortization for intangible assets
Total	$ 80	$ 46