Goodwill and Other Intangible Assets - Narrative (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) reporting_unit	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Goodwill [Line Items]
Number of reporting units | reporting_unit	13
Goodwill, Impairment Loss	$ 0	$ 0	$ 0
Total amortization expense	135,000,000	$ 65,000,000	$ 85,000,000
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2019	201,000,000
2020	194,000,000
2021	191,000,000
2022	181,000,000
2023	166,000,000
Minimum
Goodwill [Line Items]
Goodwill by reporting unit	15,000,000
Maximum
Goodwill [Line Items]
Goodwill by reporting unit	$ 1,700,000,000
Customer Relationships and Developed Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	12 years
Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life		13 years