Balance Sheet Effect of Derivative Financial Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Derivative, Notional Amount	$ 128,113	$ 148,094
Derivative Asset, Current	977	974
Derivative Asset, Noncurrent	1,223	1,956
Derivative Asset	2,200	2,930
Derivative Liability, Current	767	859
Derivative Liability, Noncurrent	542	376
Derivative Liability	1,309	1,235
Held collateral	5	9
Posted collateral	64	96
Counterparty Netting, Liabilities Not Offset	573	505
Designated as Hedging Instrument [Member] \| Foreign currency exchange contracts [Member] \| Cash Flow Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount	12,738	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	26,296	26,924
Designated as Hedging Instrument [Member] \| Commodity Contract [Member] \| Cash Flow Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount	790	703
Not Designated as Hedging Instrument [Member] \| Foreign currency exchange contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	23,258	25,956
Not Designated as Hedging Instrument [Member] \| Cross-currency interest rate swap contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	6,565	6,849
Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	56,754	70,318
Not Designated as Hedging Instrument [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	827	599
Fair Value, Recurring \| Level 2 [Member]
Derivative [Line Items]
Fair Value of Assets	2,200	2,930
Fair Value of Liabilities	1,309	1,235
Counterparty Netting, Assets Not Offset	573	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	15	47
Fair Value of Liabilities	618	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	20	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	998	1,331
Fair Value of Liabilities	152	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	172	40
Fair Value of Liabilities	0	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	185	172
Fair Value of Liabilities	266	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	317	557
Fair Value of Liabilities	17	1
Fair Value, Recurring \| Level 2 [Member] \| Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Fair Value of Assets	381	663
Fair Value of Liabilities	249	439
Fair Value, Recurring \| Level 2 [Member] \| Not Designated as Hedging Instrument [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Fair Value of Assets	112	74
Fair Value of Liabilities	$ 7	$ 4

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