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	Jun. 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	$ 1,602	$ 4,719
Notional amount, derivative and non-derivative financial instruments liabilities	4,612	3,074
Fair value, derivative and non-derivative financial instruments assets	748	505
Fair value, derivative and non-derivative financial instruments liabilities	907	335
Derivative [Member] | 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	51	0
Fair value, derivative and non-derivative financial instruments liabilities	2	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	0	0
Fair value, derivative and non-derivative financial instruments assets	20	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	300	2,000
Fair value, derivative and non-derivative financial instruments assets	12	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	15	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	2,355	950
Fair value, derivative and non-derivative financial instruments liabilities	108	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	1	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	252	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	1	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	756	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	165	3
Fair value, derivative and non-derivative financial instruments assets	55	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	103	224
Fair value, derivative and non-derivative financial instruments liabilities	17	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	235	580
Fair value, derivative and non-derivative financial instruments assets	6	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	603	200
Fair value, derivative and non-derivative financial instruments liabilities	8	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	432	162
Fair value, derivative and non-derivative financial instruments assets	433	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	218	34
Fair value, derivative and non-derivative financial instruments assets	$ 218	$ 34