Schedule of Fair Value of Derivative Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	$ 45	$ 7
Derivative Asset, Collateral, Obligation to Return Cash, Offset	0
Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	867	338
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(574)	(165)
Derivative Asset	293	173
Derivative Liability, Fair Value, Gross Liability	991	521
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(611)	(171)
Derivative Liability	380	350
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	816	219
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(536)	(139)
Derivative Asset	280	80
Derivative Liability, Fair Value, Gross Liability	744	299
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(572)	(143)
Derivative Liability	172	156
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	51	119
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(38)	(26)
Derivative Asset	13	93
Derivative Liability, Fair Value, Gross Liability	247	222
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(39)	(28)
Derivative Liability	208	194
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	182	3
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(182)	(3)
Derivative Asset	0	0
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	32	39
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(18)	(19)
Derivative Asset	14	20
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	20	74
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(16)	(25)
Derivative Asset	4	49
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	448	146
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(253)	(109)
Derivative Asset	195	37
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	29	4
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(20)	(1)
Derivative Asset	9	3
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		41
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		0
Derivative Asset		41
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	68	31
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(32)	(8)
Derivative Asset	36	23
Deferred charges and other 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	2
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(2)
Derivative Asset	0
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		7
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset		(3)
Derivative Liability		4
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	21	93
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(18)	(19)
Derivative Liability	3	74
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	95	35
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(16)	(25)
Derivative Liability	79	10
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	391	151
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(287)	(112)
Derivative Liability	104	39
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	34	9
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(21)	(3)
Derivative Liability	13	6
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	233
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(182)
Derivative Liability	51
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	115
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	0
Derivative Liability	115
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	48	48
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(34)	(9)
Derivative Liability	14	39
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	3
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(2)
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		178
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset		0
Derivative Liability		$ 178