Significant Accounting Policies Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) reportablesegments	Dec. 31, 2017 USD ($) reportablesegments	Dec. 31, 2016 USD ($) reportablesegments	Mar. 31, 2018 USD ($)	Jan. 01, 2018 USD ($)	Dec. 31, 2015 USD ($)
Significant Accounting Policies [Line Items]
Selling, general and administrative expenses	$ 3,569,000,000	$ 3,294,000,000	$ 3,099,000,000
Cash and Cash Equivalents, at Carrying Value	146,000,000	188,000,000	196,000,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	829,000,000	1,017,000,000	$ 487,000,000			$ 400,000,000
Available-for-sale Securities	0	15,000,000
Defined Benefit Plan, Accumulated Benefit Obligation	$ 213,000,000	$ 189,000,000
Number of Reportable Segments | reportablesegments	3
Number of global reporting units | reportablesegments	7	7	7
Percent of finished goods at consignment	40.00%	40.00%
Concentration Risk, Customer	0	0	0
Other Liabilities, Current	$ 412,000,000	$ 867,000,000
Other Liabilities, Noncurrent	1,882,000,000	2,370,000,000
Other Assets, Noncurrent	932,000,000	688,000,000
Deferred Tax Liabilities, Noncurrent	328,000,000	191,000,000
Shipping and Handling [Member]
Significant Accounting Policies [Line Items]
Selling, general and administrative expenses	$ 124,000,000	$ 110,000,000	$ 101,000,000
Minimum [Member] | Equipment [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Minimum [Member] | Patents [Member]
Significant Accounting Policies [Line Items]
Finite-Lived Intangible Assets, Useful Life	2 years
Minimum [Member] | Technology-related [Member]
Significant Accounting Policies [Line Items]
Finite-Lived Intangible Assets, Useful Life	5 years
Maximum [Member] | Building and Building Improvements [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Maximum [Member] | Equipment [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	7 years
Maximum [Member] | Patents [Member]
Significant Accounting Policies [Line Items]
Finite-Lived Intangible Assets, Useful Life	20 years
Maximum [Member] | Technology-related [Member]
Significant Accounting Policies [Line Items]
Finite-Lived Intangible Assets, Useful Life	25 years
Adjustments for New Accounting Pronouncement [Member]
Significant Accounting Policies [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ (233,000,000)
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets					$ 177,000,000
Accounting Standards Update 2016-16 [Member]
Significant Accounting Policies [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption				$ 55,000,000
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Significant Accounting Policies [Line Items]
Other Liabilities, Current	59,000,000
Other Liabilities, Noncurrent	205,000,000
Other Assets, Noncurrent	12,000,000
Deferred Tax Liabilities, Noncurrent	$ (41,000,000)