Balance Sheet Effect of Derivative Financial Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Notional	$ 134,526	$ 142,760
Derivative Asset, Current	290	681
Derivative Asset, Noncurrent	1,106	540
Derivative Asset	1,396	1,221
Derivative Liability, Current	617	601
Derivative Liability, Noncurrent	221	312
Derivative Liability	838	913
Held collateral	24	19
Posted collateral	85	59
Designated as Hedging Instrument [Member] \| Foreign Exchange Contract [Member] \| Cash Flow Hedging [Member]
Derivative [Line Items]
Notional	13,376	15,972
Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member] \| Fair Value Hedging [Member]
Derivative [Line Items]
Notional	25,308	22,989
Designated as Hedging Instrument [Member] \| Commodity Contract [Member] \| Cash Flow Hedging [Member]
Derivative [Line Items]
Notional	583	327
Not Designated as Hedging Instrument [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Notional	23,117	20,695
Not Designated as Hedging Instrument [Member] \| Cross-currency interest rate swap contracts [Member]
Derivative [Line Items]
Notional	7,879	5,235
Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Notional	63,877	76,904
Not Designated as Hedging Instrument [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Notional	386	638
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Derivative [Line Items]
Fair Value of Assets	1,396	1,221
Fair Value of Liabilities	838	913
Counterparty Netting, Not Offset	387	434
Counterparty Netting, Not Offset	387	434
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| Designated as Hedging Instrument [Member] \| Foreign Exchange Contract [Member] \| Cash Flow Hedging [Member]
Derivative [Line Items]
Fair Value of Assets	101	391
Fair Value of Liabilities	151	110
Fair Value, Measurements, 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	687	158
Fair Value of Liabilities	13	208
Fair Value, Measurements, 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	0
Fair Value of Liabilities	36	20
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| Not Designated as Hedging Instrument [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Fair Value of Assets	124	202
Fair Value of Liabilities	189	99
Fair Value, Measurements, 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	228	232
Fair Value of Liabilities	163	157
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Fair Value of Assets	255	235
Fair Value of Liabilities	270	274
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| Not Designated as Hedging Instrument [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Fair Value of Assets	1	3
Fair Value of Liabilities	$ 16	$ 45

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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