Financial Instruments, Derivatives and Fair Value Measures - Location of Derivative Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Derivative instruments, notional amount and fair value
Fair Value - Assets	$ 358	$ 196
Fair Value - Liabilities	869	635
Designated as hedging instrument | Interest rate swaps | Deferred income taxes and other assets | Fair value hedges
Derivative instruments, notional amount and fair value
Fair Value - Assets	232	48
Designated as hedging instrument | Foreign currency forward exchange contracts | Prepaid expenses and other receivables
Derivative instruments, notional amount and fair value
Fair Value - Assets	89	110
Designated as hedging instrument | Foreign currency forward exchange contracts | Other accrued liabilities
Derivative instruments, notional amount and fair value
Fair Value - Liabilities	241	56
Designated as hedging instrument | Debt | Long-term Debt | Net investment hedges
Derivative instruments, notional amount and fair value
Fair Value - Liabilities	566	546
Not designated as hedging instrument | Foreign currency forward exchange contracts | Prepaid expenses and other receivables
Derivative instruments, notional amount and fair value
Fair Value - Assets	37	38
Not designated as hedging instrument | Foreign currency forward exchange contracts | Other accrued liabilities
Derivative instruments, notional amount and fair value
Fair Value - Liabilities	$ 62	$ 33