Balance Sheet Effect of Derivative Financial Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Derivative, Notional Amount	$ 135,228	$ 137,179
Derivative Asset, Current	1,239	390
Derivative Asset, Noncurrent	1,968	840
Derivative Asset	3,207	1,230
Derivative Liability, Current	683	772
Derivative Liability, Noncurrent	334	306
Derivative Liability	1,017	1,078
Held collateral	20	18
Posted collateral	91	78
Designated as Hedging Instrument [Member] \| Foreign currency exchange contracts [Member] \| Cash Flow Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount	12,966	15,349
Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member] \| Fair Value Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount	24,434	26,577
Designated as Hedging Instrument [Member] \| Commodity Contract [Member] \| Cash Flow Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount	617	673
Not Designated as Hedging Instrument [Member] \| Foreign currency exchange contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	20,075	19,350
Not Designated as Hedging Instrument [Member] \| Cross-currency interest rate swap contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	5,611	5,849
Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	71,075	68,914
Not Designated as Hedging Instrument [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	450	467
Fair Value, Recurring \| Level 2 [Member]
Derivative [Line Items]
Fair Value of Assets	3,207	1,230
Fair Value of Liabilities	1,017	1,078
Counterparty Netting, Assets Not Offset	600	269
Counterparty Netting, Liabilities Not Offset	600	269
Fair Value, Recurring \| Level 2 [Member] \| Designated as Hedging Instrument [Member] \| Foreign currency exchange contracts [Member] \| Cash Flow Hedging [Member]
Derivative [Line Items]
Fair Value of Assets	371	47
Fair Value of Liabilities	55	493
Fair Value, Recurring \| Level 2 [Member] \| Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member] \| Fair Value Hedging [Member]
Derivative [Line Items]
Fair Value of Assets	1,682	702
Fair Value of Liabilities	0	19
Fair Value, Recurring \| Level 2 [Member] \| Designated as Hedging Instrument [Member] \| Commodity Contract [Member] \| Cash Flow Hedging [Member]
Derivative [Line Items]
Fair Value of Assets	2	5
Fair Value of Liabilities	69	29
Fair Value, Recurring \| Level 2 [Member] \| Not Designated as Hedging Instrument [Member] \| Foreign currency exchange contracts [Member]
Derivative [Line Items]
Fair Value of Assets	225	58
Fair Value of Liabilities	238	270
Fair Value, Recurring \| Level 2 [Member] \| Not Designated as Hedging Instrument [Member] \| Cross-currency interest rate swap contracts [Member]
Derivative [Line Items]
Fair Value of Assets	163	134
Fair Value of Liabilities	53	67
Fair Value, Recurring \| Level 2 [Member] \| Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Fair Value of Assets	752	275
Fair Value of Liabilities	573	191
Fair Value, Recurring \| Level 2 [Member] \| Not Designated as Hedging Instrument [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Fair Value of Assets	12	9
Fair Value of Liabilities	$ 29	$ 9

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