Financial Instruments and Fair Value Measurements, Summary of derivative and non-derivative financial instruments outstanding measured at fair value on a recurring basis (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Derivative and non-derivative assets and liabilities at fair value, net, by balance sheet classification [Abstract]
Notional amount, derivative and non-derivative financial instruments assets	$ 1,420	$ 4,719
Notional amount, derivative and non-derivative financial instruments liabilities	4,680	3,074
Fair value, derivative and non-derivative financial instruments assets	450	505
Fair value, derivative and non-derivative financial instruments liabilities	931	335
Derivative [Member] | Designated as hedges: [Member] | Commodities [Member] | Prepaid expenses and other current assets [Member] | Fair value, inputs, level 2 [Member]
Derivative and non-derivative assets and liabilities at fair value, net, by balance sheet classification [Abstract]
Notional amount, derivative and non-derivative financial instruments assets	60	0
Fair value, derivative and non-derivative financial instruments assets	6	0
Derivative [Member] | Designated as hedges: [Member] | Foreign currency [Member] | Prepaid expenses and other current assets [Member] | Fair value, inputs, level 2 [Member]
Derivative and non-derivative assets and liabilities at fair value, net, by balance sheet classification [Abstract]
Notional amount, derivative and non-derivative financial instruments assets	358	0
Fair value, derivative and non-derivative financial instruments assets	44	27
Derivative [Member] | Designated as hedges: [Member] | Foreign currency [Member] | Other assets [Member] | Fair value, inputs, level 2 [Member]
Derivative and non-derivative assets and liabilities at fair value, net, by balance sheet classification [Abstract]
Notional amount, derivative and non-derivative financial instruments assets	0	2,000
Fair value, derivative and non-derivative financial instruments assets	0	214
Derivative [Member] | Designated as hedges: [Member] | Foreign currency [Member] | Accrued liabilities [Member] | Fair value, inputs, level 2 [Member]
Derivative and non-derivative assets and liabilities at fair value, net, by balance sheet classification [Abstract]
Notional amount, derivative and non-derivative financial instruments liabilities	0	0
Fair value, derivative and non-derivative financial instruments liabilities	33	16
Derivative [Member] | Designated as hedges: [Member] | Foreign currency [Member] | Other liabilities [Member] | Fair value, inputs, level 2 [Member]
Derivative and non-derivative assets and liabilities at fair value, net, by balance sheet classification [Abstract]
Notional amount, derivative and non-derivative financial instruments liabilities	2,655	950
Fair value, derivative and non-derivative financial instruments liabilities	225	53
Derivative [Member] | Designated as hedges: [Member] | Interest rate contract [Member] | Prepaid expenses and other current assets [Member] | Fair value, inputs, level 2 [Member]
Derivative and non-derivative assets and liabilities at fair value, net, by balance sheet classification [Abstract]
Notional amount, derivative and non-derivative financial instruments assets	0	0
Fair value, derivative and non-derivative financial instruments assets	2	22
Derivative [Member] | Designated as hedges: [Member] | Interest rate contract [Member] | Other assets [Member] | Fair value, inputs, level 2 [Member]
Derivative and non-derivative assets and liabilities at fair value, net, by balance sheet classification [Abstract]
Notional amount, derivative and non-derivative financial instruments assets	263	1,940
Fair value, derivative and non-derivative financial instruments assets	3	41
Derivative [Member] | Designated as hedges: [Member] | Interest rate contract [Member] | Accrued liabilities [Member] | Fair value, inputs, level 2 [Member]
Derivative and non-derivative assets and liabilities at fair value, net, by balance sheet classification [Abstract]
Notional amount, derivative and non-derivative financial instruments liabilities	0	1,000
Fair value, derivative and non-derivative financial instruments liabilities	0	154
Derivative [Member] | Designated as hedges: [Member] | Interest rate contract [Member] | Other liabilities [Member] | Fair value, inputs, level 2 [Member]
Derivative and non-derivative assets and liabilities at fair value, net, by balance sheet classification [Abstract]
Notional amount, derivative and non-derivative financial instruments liabilities	1,500	700
Fair value, derivative and non-derivative financial instruments liabilities	655	77
Derivative [Member] | Not designated as hedges: [Member] | Commodities [Member] | Prepaid expenses and other current assets [Member] | Fair value, inputs, level 2 [Member]
Derivative and non-derivative assets and liabilities at fair value, net, by balance sheet classification [Abstract]
Notional amount, derivative and non-derivative financial instruments assets	69	3
Fair value, derivative and non-derivative financial instruments assets	30	0
Derivative [Member] | Not designated as hedges: [Member] | Commodities [Member] | Accrued liabilities [Member] | Fair value, inputs, level 2 [Member]
Derivative and non-derivative assets and liabilities at fair value, net, by balance sheet classification [Abstract]
Notional amount, derivative and non-derivative financial instruments liabilities	125	224
Fair value, derivative and non-derivative financial instruments liabilities	16	34
Derivative [Member] | Not designated as hedges: [Member] | Foreign currency [Member] | Prepaid expenses and other current assets [Member] | Fair value, inputs, level 2 [Member]
Derivative and non-derivative assets and liabilities at fair value, net, by balance sheet classification [Abstract]
Notional amount, derivative and non-derivative financial instruments assets	311	580
Fair value, derivative and non-derivative financial instruments assets	4	5
Derivative [Member] | Not designated as hedges: [Member] | Foreign currency [Member] | Accrued liabilities [Member] | Fair value, inputs, level 2 [Member]
Derivative and non-derivative assets and liabilities at fair value, net, by balance sheet classification [Abstract]
Notional amount, derivative and non-derivative financial instruments liabilities	400	200
Fair value, derivative and non-derivative financial instruments liabilities	2	1
Non-derivatives: [Member] | Available-for-sale debt securities [Member] | Short-term investments [Member] | Fair value, inputs, level 2 [Member]
Derivative and non-derivative assets and liabilities at fair value, net, by balance sheet classification [Abstract]
Notional amount, derivative and non-derivative financial instruments assets	359	162
Fair value, derivative and non-derivative financial instruments assets	361	162
Non-derivatives: [Member] | Equity securities [Member] | Short-term investments [Member] | Fair value, inputs, level 2 [Member]
Derivative and non-derivative assets and liabilities at fair value, net, by balance sheet classification [Abstract]
Notional amount, derivative and non-derivative financial instruments assets	0	34
Fair value, derivative and non-derivative financial instruments assets	$ 0	$ 34