Financial Instruments, Hedging Activities and Fair Value Measurements (Additional Information) (Details) $ in Millions, € in Billions	6 Months Ended	12 Months Ended
	Jun. 30, 2021 EUR (€)	Dec. 31, 2020 EUR (€)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative Instruments in Hedges, Net Investment in Foreign Operations, Assets, Fair Value, Net			$ 15		$ 8
Fair Value of Debt Instrument Designated as a Hedge of Net Investment in Foreign Operations					2,400
Accumulated pretax unrealized translation gains (losses) in AOCI, related to both the euro-denominated borrowings and the cross currency swaps that have been designated as hedges of net investments			6,411	$ 5,969	5,815	$ 4,938	$ 4,837	$ 5,403
Long-term Debt			7,091		5,334
Long-lived assets fair value amount			7,567		5,913
Finance Lease, Liability			11
Short-term debt			55		403
Capital Lease Obligations					12
Interest rate swaps
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative, Notional Amount			525
Interest Rate Derivatives, at Fair Value, Net					67	$ 48
Cross currency swaps
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative, Notional Amount			875		875
Foreign currency forward contracts
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative, Notional Amount			1,800		1,400
Foreign Currency Contracts, Liability, Fair Value Disclosure			6		2
Foreign currency forward contracts | Accounts payable and accrued liabilities | Level 1 | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative liabilities			0		0
Foreign currency forward contracts | Accounts payable and accrued liabilities | Level 2 | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative liabilities			6		6
Foreign currency forward contracts | Accounts payable and accrued liabilities | Level 3 | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative liabilities			0		0
Net Investment Hedging
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Long-term Debt | €	€ 2.0	€ 2.0
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Accumulated pretax unrealized translation gains (losses) in AOCI, related to both the euro-denominated borrowings and the cross currency swaps that have been designated as hedges of net investments			$ 71		$ 22