Accounting Policies and Supplemental Disclosures (Tables)

9 Months Ended

Sep. 30, 2020

Accounting Policies [Abstract]

Supplemental Cash Flow Information

The following table shows supplemental cash flow information (in millions):

	Three Months Ended September 30,				Nine Months Ended September 30,				Twelve Months Ended September 30,
	2019		2020		2019		2020		2019		2020
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for interest on debt	$	287	$	285	$	720	$	715	$	842	$	869
Cash paid for operating leases	872		1,159		2,420		3,275		2,420		4,215
Cash paid for interest on finance leases	167		155		481		484		585		650
Cash paid for interest on financing obligations	14		28		20		71		72		90
Cash paid for income taxes, net of refunds	241		502		692		1,293		863		1,481
Assets acquired under operating leases	2,299		6,115		5,393		11,870		5,393		14,346
Property and equipment acquired under finance leases	3,606		3,571		9,541		8,892		13,222		13,075
Property and equipment acquired under build-to-suit arrangements	390		366		1,109		1,228		2,252		1,480

Calculation of Diluted Shares

The following table shows the calculation of diluted shares (in millions):

	Three Months Ended September 30,		Nine Months Ended September 30,
	2019	2020	2019	2020
Shares used in computation of basic earnings per share	495	501	493	500
Total dilutive effect of outstanding stock awards	9	11	10	9
Shares used in computation of diluted earnings per share	504	512	503	509