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Derivative Instruments (Forward Currency Exchange Contracts) (Details) - Foreign currency exchange forward contracts $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Nov. 30, 2020 EUR (€)	Dec. 31, 2019 EUR (€)	Jul. 31, 2019 EUR (€)	Nov. 30, 2018 EUR (€)
Derivative [Line Items]
Maximum term	1793 days	1646 days
Derivative, fair value, net	$ (140)	$ 203
Notional amount	8,159	8,088
Other current assets
Derivative [Line Items]
Derivative asset	16	185
Other noncurrent assets
Derivative [Line Items]
Derivative asset	4	41
Other current liabilities
Derivative [Line Items]
Derivative liability	(133)	(21)
Other noncurrent liabilities
Derivative [Line Items]
Derivative liability	(27)	(2)
Designated as Hedging Instrument
Derivative [Line Items]
Derivative, fair value, net	(22)	40
Notional amount	1,828	1,113	€ 500,000,000	€ 2,400,000,000	€ 1,000,000,000.0	€ 2,250,000,000
Designated as Hedging Instrument \| Other current assets
Derivative [Line Items]
Derivative asset	0	0
Designated as Hedging Instrument \| Other noncurrent assets
Derivative [Line Items]
Derivative asset	4	40
Designated as Hedging Instrument \| Other current liabilities
Derivative [Line Items]
Derivative liability	0	0
Designated as Hedging Instrument \| Other noncurrent liabilities
Derivative [Line Items]
Derivative liability	(26)	0
Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative, fair value, net	(114)	169
Notional amount	5,382	6,174
Not Designated as Hedging Instrument \| Other current assets
Derivative [Line Items]
Derivative asset	7	180
Not Designated as Hedging Instrument \| Other noncurrent assets
Derivative [Line Items]
Derivative asset	0	0
Not Designated as Hedging Instrument \| Other current liabilities
Derivative [Line Items]
Derivative liability	(121)	(11)
Not Designated as Hedging Instrument \| Other noncurrent liabilities
Derivative [Line Items]
Derivative liability	0	0
Cash Flow Hedging \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative, fair value, net	(4)	(6)
Notional amount	949	801
Cash Flow Hedging \| Designated as Hedging Instrument \| Other current assets
Derivative [Line Items]
Derivative asset	9	5
Cash Flow Hedging \| Designated as Hedging Instrument \| Other noncurrent assets
Derivative [Line Items]
Derivative asset	0	1
Cash Flow Hedging \| Designated as Hedging Instrument \| Other current liabilities
Derivative [Line Items]
Derivative liability	(12)	(10)
Cash Flow Hedging \| Designated as Hedging Instrument \| Other noncurrent liabilities
Derivative [Line Items]
Derivative liability	$ (1)	$ (2)