.2 billion in 2014 and $ 10.7 billion in 2013 . the decrease in operating cash flows in 2015 as compared to 2014 was largely attributable to lower earnings before non-cash charges and credits and depreciation and amortization expense while the increase in operating cash flows in 2014 as compared to 2013 was largely attributable to higher earnings before non-cash charges and credits and depreciation and amortization expense . 2022 dividends paid during 2015 , 2014 and 2013 were $ 2.4 billion , $ 2