Balance Sheet Effect of Derivative Financial Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Derivative, Notional Amount	$ 134,940	$ 148,094
Derivative Asset, Current	956	974
Derivative Asset, Noncurrent	1,140	1,956
Derivative Asset	2,096	2,930
Derivative Liability, Current	816	859
Derivative Liability, Noncurrent	683	376
Derivative Liability	1,499	1,235
Held collateral	3	9
Posted collateral	87	96
Counterparty Netting, Liabilities Not Offset	664	505
Designated as Hedging Instrument [Member] \| Foreign currency exchange contracts [Member] \| Cash Flow Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount	14,192	15,860
Designated as Hedging Instrument [Member] \| Cross-currency interest rate swap contracts [Member] \| Fair Value Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount	885	885
Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member] \| Fair Value Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount	25,646	26,924
Designated as Hedging Instrument [Member] \| Commodity Contract [Member] \| Cash Flow Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount	750	703
Not Designated as Hedging Instrument [Member] \| Foreign currency exchange contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	24,341	25,956
Not Designated as Hedging Instrument [Member] \| Cross-currency interest rate swap contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	6,822	6,849
Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	61,608	70,318
Not Designated as Hedging Instrument [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	696	599
Fair Value, Recurring \| Level 2 [Member]
Derivative [Line Items]
Fair Value of Assets	2,096	2,930
Fair Value of Liabilities	1,499	1,235
Counterparty Netting, Assets Not Offset	664	505
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	2	47
Fair Value of Liabilities	677	383
Fair Value, Recurring \| Level 2 [Member] \| Designated as Hedging Instrument [Member] \| Cross-currency interest rate swap contracts [Member] \| Fair Value Hedging [Member]
Derivative [Line Items]
Fair Value of Assets	2	46
Fair Value of Liabilities	0	0
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	934	1,331
Fair Value of Liabilities	204	4
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	103	40
Fair Value of Liabilities	1	5
Fair Value, Recurring \| Level 2 [Member] \| Not Designated as Hedging Instrument [Member] \| Foreign currency exchange contracts [Member]
Derivative [Line Items]
Fair Value of Assets	258	172
Fair Value of Liabilities	274	399
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	275	557
Fair Value of Liabilities	25	1
Fair Value, Recurring \| Level 2 [Member] \| Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Fair Value of Assets	425	663
Fair Value of Liabilities	314	439
Fair Value, Recurring \| Level 2 [Member] \| Not Designated as Hedging Instrument [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Fair Value of Assets	97	74
Fair Value of Liabilities	$ 4	$ 4

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