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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Share [Abstract]        
Shareholders' net income $ 1,408 $ 806 $ 2,776 $ 1,721
Shares:        
Weighted average 377,962 242,453 378,672 242,316
Common stock equivalents 3,007 2,886 3,824 3,248
Total shares 380,969 245,339 382,496 245,564
EPS, basic $ 3.73 $ 3.32 $ 7.33 $ 7.10
EPS, effect of dilution (0.03) (0.03) (0.07) (0.09)
EPS, diluted $ 3.70 $ 3.29 $ 7.26 $ 7.01
Employee Stock Option [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Antidilutive options 5,400 900 4,100 900