Revenue Recognition (Tables)

3 Months Ended

Mar. 31, 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
	March 31, 2018
Revenues:
United States	$	91,153
Foreign:
Asia	1,700
Canada	3,260
Europe	5,047
Mexico	623
Middle East	2,152
Other	1,106
Total	$	105,041

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

	Three Months Ended
	March 31, 2018
Revenue recognized over time	$	2,687
Revenue recognized at a point in time	102,354
Total	$	105,041

Contract with Customer, Liability and Receivables

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

	March 31, 2018		December 31, 2017
Receivables	$	63,372	$	58,210
Contract liabilities	$	10,620	$	9,670