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Information Relating to the Consolidated Statement of Cash Flows - Narrative (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Purchases (in shares) | 10,302,969 | 6,255,290 | 23,342,737 | 6,262,987
Purchases of treasury shares | $ 1,250 | $ 750 | $ 2,789 | $ 751
Dividends paid (in dollars per share) | $ 1.19 | $ 1.12 | $ 3.57 | $ 3.36
Share Repurchase Programs |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Purchases (in shares) |  |  | 23,300 | 6,300
Purchases of treasury shares |  |  | $ 2,800 | $ 750

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