Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2016

Commitments and Contingencies

Summary of commitments under capital leases and noncancelable operating leases

At December 31, 2016, commitments under noncancelable leases with initial terms in excess of one year were as follows (amounts in millions):

Year ended December 31,
2017	$	122
2018		118
2019		97
2020		54
2021		37
Thereafter		90
	$	518

Summary of comitments and obligations from letters of credit, purchase obligations and guarantees

			By period
			Less than	1 to 3	3 to 5	More than
	Total		1 year	years	years	5 years
	amounts in millions
Purchase obligations	$	277	247	29	1	—
Guarantees		150	150	—	—	—
Letters of credit		49	44	5	—	—
	$	476	441	34	1	—