Schedule of Fair Value of Derivative Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	$ 5	$ 5
Derivative Asset, Collateral, Obligation to Return Cash, Offset	0	3
Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	513	274
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(226)	(106)
Derivative Asset	287	168
Derivative Liability, Fair Value, Gross Liability	734	530
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(230)	(111)
Derivative Liability	504	419
Fair Value, Inputs, Level 2 [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	362	198
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(195)	(77)
Derivative Asset	167	121
Derivative Liability, Fair Value, Gross Liability	378	203
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(199)	(82)
Derivative Liability	179	121
Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	151	76
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(31)	(29)
Derivative Asset	120	47
Derivative Liability, Fair Value, Gross Liability	356	327
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(31)	(29)
Derivative Liability	325	298
Other Current Assets [Member] | Interest Rate Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	120	21
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(75)	(13)
Derivative Asset	45	8
Other Current Assets [Member] | Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	51	105
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(34)	(36)
Derivative Asset	17	69
Other Current Assets [Member] | Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	35	44
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(29)	(12)
Derivative Asset	6	32
Other Current Assets [Member] | Commodity Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	129	44
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(61)	(25)
Derivative Asset	68	19
Other Current Assets [Member] | Commodity Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	7	18
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(2)	(3)
Derivative Asset	5	15
Other Current Assets [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		14
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		(14)
Derivative Asset		0
Deferred charges and other assets [Member] | Interest Rate Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	109
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	0
Derivative Asset	109
Deferred charges and other assets [Member] | Commodity Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	62	28
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(25)	(3)
Derivative Asset	37	25
Accrued and Other Current Liabilities [Member] | Interest Rate Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	75	23
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(75)	(13)
Derivative Liability	0	10
Accrued and Other Current Liabilities [Member] | Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	72	46
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(34)	(36)
Derivative Liability	38	10
Accrued and Other Current Liabilities [Member] | Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	63	23
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(29)	(12)
Derivative Liability	34	11
Accrued and Other Current Liabilities [Member] | Commodity Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	129	95
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(65)	(29)
Derivative Liability	64	66
Accrued and Other Current Liabilities [Member] | Commodity Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	8	17
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(2)	(3)
Derivative Liability	6	14
Accrued and Other Current Liabilities [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		136
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset		(14)
Derivative Liability		122
Other Noncurrent Obligations [Member] | Interest Rate Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	1	1
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	0	0
Derivative Liability	1	1
Other Noncurrent Obligations [Member] | Interest Rate Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	285
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	0
Derivative Liability	285
Other Noncurrent Obligations [Member] | Commodity Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	101	38
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(25)	(4)
Derivative Liability	$ 76	34
Other Noncurrent Obligations [Member] | Commodity Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		1
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset		0
Derivative Liability		1
Other Noncurrent Obligations [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		150
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset		0
Derivative Liability		$ 150