Fair Value Measurements - Summary of Financial Instruments Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange contracts	$ 15	$ 11
Debt securities	5
Interest rate contracts		10
Marketable equity securities	15	3
Total assets	35	24
Foreign exchange contracts	12	2
Interest rate contracts	179	52
Contingent payments related to acquisitions	30	39
Total liabilities	221	93
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange contracts	0	0
Debt securities	0
Interest rate contracts		0
Marketable equity securities	15	3
Total assets	15	3
Foreign exchange contracts	0	0
Interest rate contracts	0	0
Contingent payments related to acquisitions	0	0
Total liabilities	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange contracts	15	11
Debt securities	5
Interest rate contracts		10
Marketable equity securities	0	0
Total assets	20	21
Foreign exchange contracts	12	2
Interest rate contracts	179	52
Contingent payments related to acquisitions	0	0
Total liabilities	191	54
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange contracts	0	0
Debt securities	0
Interest rate contracts		0
Marketable equity securities	0	0
Total assets	0	0
Foreign exchange contracts	0	0
Interest rate contracts	0	0
Contingent payments related to acquisitions	30	39
Total liabilities	$ 30	$ 39