Statement of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Operating Revenue	$ 14,314	$ 13,599	$ 13,405
Cost of revenue	8,309	7,896	7,888
Selling, administrative, and research and development expenses	2,400	2,415	2,417
Legal settlement (income)	(95)	0	0
Amortization and impairment of intangible assets	206	224	233
Operating Income	3,494	3,064	2,867
Interest expense	(260)	(237)	(226)
Other income (expense)	36	81	78
Income Before Taxes	3,270	2,908	2,719
Income taxes	1,583	873	820
Net Income	$ 1,687	$ 2,035	$ 1,899
Net Income Per Share:
Basic (in dollars per share)	$ 4.90	$ 5.73	$ 5.16
Diluted (in dollars per share)	$ 4.86	$ 5.70	$ 5.13