Free Cash Flow Reconciliation ($ in millions) Q4'15 Q1'16 Q2'16 Q3'16 Q4'16 Q1'17 Q2'17 Q3'17 Q4'17 Net cash provided by operating activities $ 3,393 $ 3,477 $ 3,665 $ 4,036 $ 4,930 $ 5,058 $ 5,360 $ 6,128 $ 7,670 Less: Purchases of property and equipment 692 1,132 995 1,095 1,269 1,271 1,444 1,755 2,262 Free Cash Flow $ 2,701 $ 2,345 $ 2,670 $ 2,941 $ 3,661 $ 3,787 $ 3,916 $ 4,373 $ 5,408 Free Cash Flow (FCF) is a non-GAAP financial measure that has limitations as an analytical tool, and you should not consider it in isolation or as a substitute for analysis of other GAAP financial measures, such as net cash provided by operating activities. Some of the limitations of FCF are: (i) FCF does not reflect our future contractual commitments, and (ii) other companies in our industry present similarly titled measures differently than we do, limiting their usefulness as comparative measures. FCF is not intended to represent our residual cash flow available for discretionary expenditures. 17