Supplementary Information

12 Months Ended

Dec. 31, 2017

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information Related Text

Supplementary Information

Cash paid for interest and income taxes was as follows:

	Year Ended December 31,
(Dollars in millions)	2017		2016		2015
Interest paid	$	538	$	467	$	477
Income taxes paid, net of refunds	87		161		331

In 2017 and 2016, we had non-cash financing obligations related to financed insurance premium and capital lease of equipment of $24 million and $25 million, respectively. During 2017, we purchased $50 million of held-to-maturity Angolan government bonds maturing in 2020: The carrying value of these investments approximate their fair value.