Revenue Recognition (Tables)

6 Months Ended

Jun. 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		Six Months Ended
	June 30, 2018		June 30, 2018
Revenues:
United States	$	97,910	$	189,063
Foreign:
Asia	3,161		4,861
Canada	3,529		6,789
Europe	5,101		10,148
Mexico	483		1,106
Middle East	3,204		5,356
Other	260		1,366
Total	$	113,648	$	218,689

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

	Three Months Ended		Six Months Ended
	June 30, 2018		June 30, 2018
Revenue recognized over time	$	3,061	5,748
Revenue recognized at a point in time	110,587		212,941
Total	$	113,648	$	218,689

Contract with Customer, Liability and Receivables

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

	June 30, 2018		December 31, 2017
Receivables	$	65,303	$	58,210
Contract liabilities	$	13,460	$	9,670