Balance Sheet Effect of Derivative Financial Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Derivative, Notional Amount	$ 134,219	$ 137,179
Derivative Asset, Current	1,388	390
Derivative Asset, Noncurrent	2,021	840
Derivative Asset	3,409	1,230
Derivative Liability, Current	759	772
Derivative Liability, Noncurrent	492	306
Derivative Liability	1,251	1,078
Held collateral	23	18
Posted collateral	86	78
Designated as Hedging Instrument [Member] \| Foreign currency exchange contracts [Member] \| Cash Flow Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount	13,148	15,349
Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member] \| Fair Value Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount	23,663	26,577
Designated as Hedging Instrument [Member] \| Commodity Contract [Member] \| Cash Flow Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount	665	673
Not Designated as Hedging Instrument [Member] \| Foreign currency exchange contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	17,509	19,350
Not Designated as Hedging Instrument [Member] \| Cross-currency interest rate swap contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	5,938	5,849
Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	72,822	68,914
Not Designated as Hedging Instrument [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	474	467
Fair Value, Recurring [Member] \| Level 2 [Member]
Derivative [Line Items]
Fair Value of Assets	3,409	1,230
Fair Value of Liabilities	1,251	1,078
Counterparty Netting, Assets Not Offset	841	269
Counterparty Netting, Liabilities Not Offset	841	269
Fair Value, Recurring [Member] \| Level 2 [Member] \| Designated as Hedging Instrument [Member] \| Foreign currency exchange contracts [Member] \| Cash Flow Hedging [Member]
Derivative [Line Items]
Fair Value of Assets	606	47
Fair Value of Liabilities	168	493
Fair Value, Recurring [Member] \| Level 2 [Member] \| Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member] \| Fair Value Hedging [Member]
Derivative [Line Items]
Fair Value of Assets	1,549	702
Fair Value of Liabilities	0	19
Fair Value, Recurring [Member] \| Level 2 [Member] \| Designated as Hedging Instrument [Member] \| Commodity Contract [Member] \| Cash Flow Hedging [Member]
Derivative [Line Items]
Fair Value of Assets	0	5
Fair Value of Liabilities	108	29
Fair Value, Recurring [Member] \| Level 2 [Member] \| Not Designated as Hedging Instrument [Member] \| Foreign currency exchange contracts [Member]
Derivative [Line Items]
Fair Value of Assets	476	58
Fair Value of Liabilities	130	270
Fair Value, Recurring [Member] \| Level 2 [Member] \| Not Designated as Hedging Instrument [Member] \| Cross-currency interest rate swap contracts [Member]
Derivative [Line Items]
Fair Value of Assets	126	134
Fair Value of Liabilities	238	67
Fair Value, Recurring [Member] \| Level 2 [Member] \| Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Fair Value of Assets	651	275
Fair Value of Liabilities	561	191
Fair Value, Recurring [Member] \| Level 2 [Member] \| Not Designated as Hedging Instrument [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Fair Value of Assets	1	9
Fair Value of Liabilities	$ 46	$ 9

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