Balance Sheet Effect of Derivative Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Notional	$ 132,073	$ 134,914
Derivative Asset, Current	937	1,108
Derivative Asset, Noncurrent	733	787
Derivative Asset	1,670	1,895
Derivative Liability, Current	612	371
Derivative Liability, Noncurrent	372	248
Derivative Liability	984	619
Held collateral	11	15
Posted collateral	31	12
Designated as Hedging Instrument [Member] \| Foreign Exchange Contract [Member] \| Cash Flow Hedging [Member]
Derivative [Line Items]
Notional	18,734	19,091
Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member] \| Fair Value Hedging [Member]
Derivative [Line Items]
Notional	31,802	33,175
Not Designated as Hedging Instrument [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Notional	19,792	17,227
Not Designated as Hedging Instrument [Member] \| Cross-currency interest rate swap contracts [Member]
Derivative [Line Items]
Notional	3,998	3,201
Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Notional	57,144	61,689
Not Designated as Hedging Instrument [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Notional	603	531
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Derivative [Line Items]
Fair Value of Assets	1,670	1,895
Fair Value of Liabilities	984	619
Counterparty Netting, Not Offset	669	554
Counterparty Netting, Not Offset	669	554
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	466	620
Fair Value of Liabilities	352	257
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	323	487
Fair Value of Liabilities	132	80
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	259	379
Fair Value of Liabilities	357	194
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	370	242
Fair Value of Liabilities	22	8
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	227	156
Fair Value of Liabilities	119	74
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| Not Designated as Hedging Instrument [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Fair Value of Assets	25	11
Fair Value of Liabilities	$ 2	$ 6

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

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