Quarterly Operating Results (unaudited) (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Data [Line Items]
Restructuring and integration charges	$ 42	$ 23	$ 23	$ 18	$ 24	$ 18	$ 19	$ 21
Share-based compensation, excess tax benefit, amount	1	7	13	16	2	3	2	2	$ 37	$ 9
Pre-tax gain (loss) recognized									0	118	$ 334
Focus Diagnostics Products [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Quarterly Financial Data [Line Items]
Pre-tax gain (loss) recognized							118			118
Domestic Country [Member]
Quarterly Financial Data [Line Items]
Tax Cuts and Jobs Act of 2017, income tax expense (benefit)	(106)								(106)
Tax Cuts and Jobs Act of 2017, deferred tax expense (benefit)	(115)								(115)
Tax Cuts and Jobs Act of 2017, current income tax expense (benefit)	9								$ 9
Other Nonoperating Income (Expense) [Member]
Quarterly Financial Data [Line Items]
Gain related to sale			7
Losses on extinguishment of debt										$ 48	$ 144
Other Operating (Income) Expense [Member]
Quarterly Financial Data [Line Items]
Gain on escrow recovery						21
Income (Loss) from Equity Method Investments [Member]
Quarterly Financial Data [Line Items]
Restructuring and integration charges			1		1		1	2
Non-cash asset impairment charges and costs incurred as a result of hurricanes [Member]
Quarterly Financial Data [Line Items]
Asset impairment charges and costs incurred as a result of hurricanes	6	9
Non-cash asset impairment charges and costs incurred as a result of hurricanes [Member] | Other Nonoperating Income (Expense) [Member]
Quarterly Financial Data [Line Items]
Asset impairment charges and costs incurred as a result of hurricanes		5
Non-cash asset impairment charges and costs incurred as a result of hurricanes [Member] | Cost of Sales [Member]
Quarterly Financial Data [Line Items]
Asset impairment charges and costs incurred as a result of hurricanes	2	3
Non-cash asset impairment charges and costs incurred as a result of hurricanes [Member] | Selling, General and Administrative Expenses [Member]
Quarterly Financial Data [Line Items]
Asset impairment charges and costs incurred as a result of hurricanes	4	1
Retirement of Debt [Member] | Other Nonoperating Income (Expense) [Member]
Quarterly Financial Data [Line Items]
Losses on extinguishment of debt								48
Cost of Sales [Member]
Quarterly Financial Data [Line Items]
Restructuring and integration charges	14	12	9	10	15	8	10	7
Selling, General and Administrative Expenses [Member]
Quarterly Financial Data [Line Items]
Restructuring and integration charges	$ 28	$ 11	13	$ 8	7	$ 10	8	12
Selling, General and Administrative Expenses [Member] | Legal Matters [Member]
Quarterly Financial Data [Line Items]
Legal costs			$ 2				1	2
Other Operating (Income) Expense [Member]
Quarterly Financial Data [Line Items]
Restructuring and integration charges					1
Impairment charges					$ 6			1
Non-cash Asset Impairment Charges [Member] | Other Nonoperating Income (Expense) [Member]
Quarterly Financial Data [Line Items]
Non-cash asset impairment charges							$ 6	$ 1