Fair Value Measurements - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) contract	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, loss on derivative	$ 1	$ 1
Derivative, gain on derivative			$ 1
Fair value of earn out liability		14	14
Other operating income from earn out liability adjustment			$ 13
Fair value of contingent consideration	0
Proceeds from equity method investment, distribution	$ 2
Foreign exchange swap | Maturity Beyond Six Months
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of foreign currency derivatives held | contract	0
Foreign exchange forward contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	$ 291	103
Derivative liability	$ 1	$ 1
Maximum | Foreign exchange swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Maturity period of swap contracts	6 months
Fair Value Measured at Net Asset Value Per Share
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	$ 10			$ 15