Unregistered Sales of Equity Securities and Use of Proceeds The following table summarizes the surrenders of our equity securities during the three months ended December 31, 2018: (a) Includes shares repurchased as part of publicly announced programs and shares of common stock surrendered to the Company to satisfy tax withholding obligations in connection with the vesting of awards under our long-term incentive program. (b) In May 2010, the Board of Directors authorized the repurchase of up to $3.0 billion of common stock and in June 2012 increased its authorization for the repurchase of common stock by an additional $3.0 billion. In October 2016, the Board of Directors approved a new share repurchase program authorizing the repurchase of an additional $3.0 billion of common stock. The stock repurchase program does not have an expiration date. 27 Period Total Number of Shares Purchased (a) Average Price Paid per Share (a) Total Number of Shares Purchased as Part of Publicly Announced Programs (b) Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs (b) Dollars in Millions, Except Per Share Data October 1 to 31, 2018 7,987 $ 62.01 — $ 1,348 November 1 to 30, 2018 13,978 52.52 — 1,348 December 1 to 31, 2018 16,110 53.02 — 1,348 Three months ended December 31, 2018 38,075 —