Schedule of Fair Value of Derivative Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	$ 18	$ 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	657	274
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(319)	(106)
Derivative Asset	338	168
Derivative Liability, Fair Value, Gross Liability	875	530
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(325)	(111)
Derivative Liability	550	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	434	198
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(286)	(77)
Derivative Asset	148	121
Derivative Liability, Fair Value, Gross Liability	492	203
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(292)	(82)
Derivative Liability	200	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	223	76
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(33)	(29)
Derivative Asset	190	47
Derivative Liability, Fair Value, Gross Liability	383	327
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(33)	(29)
Derivative Liability	350	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	171	21
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(130)	(13)
Derivative Asset	41	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	66	105
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(53)	(36)
Derivative Asset	13	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	61	44
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(31)	(12)
Derivative Asset	30	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	117	44
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(70)	(25)
Derivative Asset	47	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	11	18
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(2)	(3)
Derivative Asset	9	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	149
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	0
Derivative Asset	149
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	80	28
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(33)	(3)
Derivative Asset	47	25
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	0
Derivative Asset	2
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	130	23
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(130)	(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	62	46
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(53)	(36)
Derivative Liability	9	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	48	23
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(31)	(12)
Derivative Liability	17	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	158	95
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(76)	(29)
Derivative Liability	82	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	12	17
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(2)	(3)
Derivative Liability	10	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	322
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	0
Derivative Liability	322
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	141	38
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(33)	(4)
Derivative Liability	108	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	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 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