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Financial Instruments - Narrative (Details) € in Billions	9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2020 EUR (€)	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Derivative [Line Items]
Notional value			$ 10,411,000,000	$ 12,112,000,000
Net Investment Hedging
Derivative [Line Items]
Exchange rate movements reducing long-term debt	$ 206,000,000
Derivatives Designated as Hedging Instruments:
Derivative [Line Items]
Notional value			2,318,000,000	2,399,000,000
Interest Rate Swap | Derivatives Designated as Hedging Instruments:
Derivative [Line Items]
Notional value			1,839,000,000	1,908,000,000
Interest Rate Swap | Derivatives Designated as Hedging Instruments: | Fair Value Hedging
Derivative [Line Items]
Notional value			1,839,000,000	1,908,000,000
Line of Credit
Derivative [Line Items]
Intercompany Euro-denominated credit facility loan		€ 2.4	2,900,000,000
Line of Credit | Net Investment Hedging
Derivative [Line Items]
Exchange rate movements reducing long-term debt	$ 244,000,000
3.00% Notes due 2021
Derivative [Line Items]
Face amount			$ 500,000,000
Interest rate		3.00%	3.00%
2.20% Notes due 2022
Derivative [Line Items]
Face amount				$ 500,000,000
Interest rate		2.20%	2.20%	2.20%

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