Statement of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Operating Revenue	$ 3,599	$ 3,431	$ 7,070	$ 6,705
Cost of revenue	2,087	1,967	4,091	3,863
Selling, administrative, and research and development expenses	586	617	1,191	1,214
Amortization and impairment of intangible assets	52	55	105	114
Operating Income	874	792	1,683	1,514
Interest expense	(65)	(58)	(129)	(116)
Other income (expense)	10	17	14	21
Income Before Taxes	819	751	1,568	1,419
Income Taxes	232	226	445	426
Net Income	$ 587	$ 525	$ 1,123	$ 993
Net Income Per Share:
Basic (in dollars per share)	$ 1.70	$ 1.47	$ 3.25	$ 2.76
Diluted (in dollars per share)	1.69	1.46	3.23	2.75
Cash Dividends Per Share:
Paid (in dollars per share)	0.65	0.55	1.30	1.10
Declared (in dollars per share)	$ 0.65	$ 0.55	$ 1.30	$ 1.10
Shares of Common Stock Outstanding During the Period:
Average (in shares)	344.7	356.6	345.4	359.3
Average assuming dilution (in shares)	347.5	358.5	348.3	361.2