Earnings Per Share Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator
Net income	$ 1,420	$ 2,048	$ 3,113	$ 3,910
Denominator
Basic weighted-average shares outstanding	1,004	1,020	1,005	1,023
Dilutive stock options and stock units	4	5	4	5
Diluted weighted-average shares outstanding	1,008	1,025	1,009	1,028
Earnings per Share
Basic	$ 1.41	$ 2.01	$ 3.10	$ 3.82
Diluted	$ 1.41	$ 2.00	$ 3.08	$ 3.80