Balance Sheet Effect of Derivative Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Derivative, Notional Amount	$ 138,460	$ 137,179
Derivative Asset, Current	1,169	390
Derivative Asset, Noncurrent	1,801	840
Derivative Asset	2,970	1,230
Derivative Liability, Current	517	772
Derivative Liability, Noncurrent	264	306
Derivative Liability	781	1,078
Held collateral	11	18
Posted collateral	103	78
Counterparty Netting, Liabilities Not Offset	469	269
Designated as Hedging Instrument [Member] \| Foreign currency exchange contracts [Member] \| Cash Flow Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount	14,100	15,349
Designated as Hedging Instrument [Member] \| Cross-currency interest rate swap contracts [Member] \| Fair Value Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount	885	0
Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member] \| Fair Value Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount	23,224	26,577
Designated as Hedging Instrument [Member] \| Commodity Contract [Member] \| Cash Flow Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount	631	673
Not Designated as Hedging Instrument [Member] \| Foreign currency exchange contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	21,758	19,350
Not Designated as Hedging Instrument [Member] \| Cross-currency interest rate swap contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	6,285	5,849
Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	71,071	68,914
Not Designated as Hedging Instrument [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	506	467
Fair Value, Recurring \| Level 2 [Member]
Derivative [Line Items]
Fair Value of Assets	2,970	1,230
Fair Value of Liabilities	781	1,078
Counterparty Netting, Assets Not Offset	469	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	217	47
Fair Value of Liabilities	76	493
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	0	0
Fair Value of Liabilities	11	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	1,417	702
Fair Value of Liabilities	1	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	9	5
Fair Value of Liabilities	29	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	244	58
Fair Value of Liabilities	126	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	377	134
Fair Value of Liabilities	20	67
Fair Value, Recurring \| Level 2 [Member] \| Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Fair Value of Assets	675	275
Fair Value of Liabilities	510	191
Fair Value, Recurring \| Level 2 [Member] \| Not Designated as Hedging Instrument [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Fair Value of Assets	31	9
Fair Value of Liabilities	$ 8	$ 9

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