Schedule of Fair Value of Derivative Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	$ 6	$ 5
Derivative Asset, Collateral, Obligation to Return Cash, Offset	1	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	696	274
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(316)	(106)
Derivative Asset	380	168
Derivative Liability, Fair Value, Gross Liability	971	530
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(315)	(111)
Derivative Liability	656	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	450	198
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(271)	(77)
Derivative Asset	179	121
Derivative Liability, Fair Value, Gross Liability	544	203
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(271)	(82)
Derivative Liability	273	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	246	76
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(45)	(29)
Derivative Asset	201	47
Derivative Liability, Fair Value, Gross Liability	427	327
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(44)	(29)
Derivative Liability	383	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	192	21
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(156)	(13)
Derivative Asset	36	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	109	105
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(80)	(36)
Derivative Asset	29	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	65	44
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(41)	(12)
Derivative Asset	24	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	82	44
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(32)	(25)
Derivative Asset	50	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	22	18
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(4)	(3)
Derivative Asset	18	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	158
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	0
Derivative Asset	158
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	67	28
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(3)	(3)
Derivative Asset	64	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	1
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	0
Derivative Asset	1
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	156	23
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(156)	(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	88	46
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(80)	(36)
Derivative Liability	8	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	71	23
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(40)	(12)
Derivative Liability	31	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	152	95
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(32)	(29)
Derivative Liability	120	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	24	17
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(4)	(3)
Derivative Liability	20	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
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset		0
Derivative Liability		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	331
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	0
Derivative Liability	331
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	148	38
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	(3)	(4)
Derivative Liability	145	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