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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
NUMERATOR:                      
Net income $ 654 $ 615 $ 733 $ 463 $ 1,747 [1] $ 528 $ 743 $ 339 $ 2,465 $ 3,357 $ 2,183
Incremental income effect of interest on 5.25% convertible notes                 0 0 2
Net income after assumed conversion                 $ 2,465 $ 3,357 $ 2,185
DENOMINATOR:                      
Weighted-average shares outstanding, basic                 573 601 627
Dilutive effect of Employee stock options and restricted stock units                 1 2 1
Dilutive effect of 5.25% convertible notes                 0 0 5
Adjusted weighted-average shares outstanding, diluted                 574 603 633
NET INCOME PER SHARE:                      
Basic (in dollars per share) $ 1.17 $ 1.08 $ 1.27 $ 0.79 $ 2.95 [1] $ 0.88 $ 1.23 $ 0.55 $ 4.30 $ 5.58 $ 3.48
Diluted (in dollars per share) $ 1.17 $ 1.08 $ 1.27 $ 0.79 $ 2.94 [1] $ 0.88 $ 1.23 $ 0.55 $ 4.29 $ 5.57 $ 3.45
Convertible Debt | 5.25% Convertible Senior Notes due 2016                      
Potentially dilutive amounts excluded from calculations:                      
Debt Instrument, Interest Rate, Stated Percentage 5.25%       5.25%       5.25% 5.25% 5.25%
[1] Includes a $1.3 billion reduction in Provision for income taxes related to the Tax Cuts and Jobs Act legislation enacted in December 2017, which resulted in a re-measurement of the Company's deferred tax assets and liabilities at the new federal corporate tax rate of 21 percent. See Note 14 to the Consolidated Financial Statements for further information.