(In millions) | 2013 | 2012 | 2011 | ||||||||
Net cash provided by operating activities included: | |||||||||||
Interest paid (net of amounts capitalized) | $ | 307 | $ | 225 | $ | 268 | |||||
Income taxes paid to taxing authorities | 3,904 | 4,974 | 2,893 | ||||||||
Commercial paper: | |||||||||||
Issuances | $ | 10,870 | $ | 13,880 | $ | 421 | |||||
Repayments | (10,935 | ) | (13,680 | ) | (421 | ) | |||||
Net commercial paper | $ | (65 | ) | $ | 200 | $ | — | ||||
Noncash investing and financing activities, related to continuing operations: | |||||||||||
Additions to property, plant and equipment: | |||||||||||
Asset retirement costs capitalized, excluding acquisitions | $ | 319 | $ | 257 | $ | 148 | |||||
Change in capital expenditure accrual | (9 | ) | 187 | 104 | |||||||
Liabilities assumed in acquisitions | — | 109 | 126 | ||||||||
Asset retirement obligations assumed by buyer | 92 | 8 | 5 | ||||||||
Debt payments made by United States Steel | — | 20 | 214 | ||||||||