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Financial Instruments - Narrative (Details) € in Billions	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2020 EUR (€)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Derivative [Line Items]
Notional Amounts			$ 9,831,000,000	$ 12,112,000,000
Net Investment Hedging
Derivative [Line Items]
Derivatives used in net investment hedge increase (decrease) since inception, gross of tax	$ 206,000,000
Designated as Hedging Instrument
Derivative [Line Items]
Notional Amounts			2,278,000,000	2,399,000,000
Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Notional Amounts			1,923,000,000	1,908,000,000
Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Swap
Derivative [Line Items]
Notional Amounts			1,923,000,000	$ 1,908,000,000
Line of Credit
Derivative [Line Items]
Intercompany Euro-denominated credit facility loan		€ 1.7	2,100,000,000
Line of Credit | Net Investment Hedging
Derivative [Line Items]
Derivatives used in net investment hedge increase (decrease) since inception, gross of tax	$ 344,000,000
2.20% Notes due 2022
Derivative [Line Items]
Debt instrument, face amount			$ 500,000,000
Debt instrument, interest rate		2.20%	2.20%

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Derivatives used in Net Investment Hedge Increase (Decrease) since inception, Gross of Tax

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