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Significant Accounting Policies - Basis of Presentation (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle    
Net sales $ 8,278 $ 7,685
Operating expenses    
Cost of sales 4,236 3,882
Selling, general and administrative expenses 2,573 1,614
Research, development and related expenses 486 476
Gain on sale of businesses (24) (29)
Total operating expenses 7,271 5,943
Operating income 1,007 1,742
Other expense (income), net 42 5
Income before income taxes $ 965 1,737
Previously Reported | ASU 2017-07 Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost    
New Accounting Pronouncements or Change in Accounting Principle    
Net sales   7,685
Operating expenses    
Cost of sales   3,869
Selling, general and administrative expenses   1,600
Research, development and related expenses   471
Gain on sale of businesses   (29)
Total operating expenses   5,911
Operating income   1,774
Other expense (income), net   37
Income before income taxes   1,737
Change | ASU 2017-07 Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost    
Operating expenses    
Cost of sales   13
Selling, general and administrative expenses   14
Research, development and related expenses   5
Total operating expenses   32
Operating income   (32)
Other expense (income), net   $ (32)