Revenue Recognition (Tables)

9 Months Ended

Sep. 30, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

Information regarding revenues disaggregated by geographic area is as follows (in millions):

	Three Months Ended		Nine Months Ended
	September 30, 2018		September 30, 2018
Revenues:
United States	$	95,288	$	284,351
Foreign:
Asia	1,928		6,789
Canada	2,564		9,353
Europe	4,457		14,605
Mexico	1,031		2,137
Middle East	4,602		9,958
Other	760		2,126
Total	$	110,630	$	329,319

Information regarding revenues disaggregated by the timing of when goods and services are transferred is as follows (in millions):

	Three Months Ended		Nine Months Ended
	September 30, 2018		September 30, 2018
Revenue recognized over time	$	3,455	9,203
Revenue recognized at a point in time	107,175		320,116
Total	$	110,630	$	329,319

Contract with Customer, Liability and Receivables

The opening and closing balances of the Company's receivables and contract liabilities are as follows:

	September 30, 2018		December 31, 2017
Receivables	$	70,029	$	58,210
Contract liabilities	$	14,363	$	9,670