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Earnings Per Share - Schedule of Share Repurchases (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 30, 2016
Earnings Per Share [Abstract] |  |  |
Stock repurchased (in shares) | 72 | 39 | 38
Cost of Shares | $ 4,671 | $ 1,970 | $ 1,056
Average Price Paid per Share (in dollars per share) | $ 64.64 | $ 50.80 | $ 27.52

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