Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2015

Commitments And Contingencies [Abstract]

Future Minimum Rental Commitments for All Long-Term Noncancelable Operating Leases

($ in millions)	Operating Leases
Year ending December 31:
2016	$	64
2017		10
2018		8
2019		10
2020		15
Thereafter		70
Total minimum lease payments	$	177

Future Payments for Obligations under Noncancelable Long Distance Contracts and Service Agreements

($ in millions)	Amount
Year ending December 31:
2016	$	26
2017		27
2018		16
2019		3
2020		3
Thereafter		-
Total	$	75

Outstanding Performance Letters of Credit

($ in millions)	Amount
CNA Financial Corporation (CNA)	$	49
All other		1
Total	$	50