Accounting Policies - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash flows from operating activities				$ 1,158	$ 1,557	$ 1,728
Loss on deconsolidation of Venezuelan subsidiary		$ 646		0	0	646
Research and development expenditures				406	388	382
Advertising costs				320	355	385
Maximum cash investments with single counterparty				218
Capital lease obligations				5	3	3
Accrued capital expenditures remaining unpaid				265	264
Payments for capital expenditures accrued and unpaid in prior year				264	254
Restricted net assets				807
Depreciation expense for property, plant and equipment				779	726	697
Cost of goods sold				11,719	10,972	12,164
Scenario, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of goods sold	$ 24
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-15
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash flows from operating activities					53	$ 41
Selling, Administrative, and General Expense and Cost of Goods Sold | Scenario, Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Defined benefit plans, service related costs			$ 35
Other (Income) Expense | Scenario, Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Defined benefit plans, non-service related costs			90
Other (Income) Expense | Accounting Standards Update 2017-17 | Pro Forma
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Defined benefit plans, non-service related costs				62	35
Corporate | Selling, Administrative, and General Expense and Cost of Goods Sold | Scenario, Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Defined benefit plans, service related costs			5
Corporate | Other (Income) Expense | Scenario, Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Defined benefit plans, non-service related costs			$ 15
Corporate | Other (Income) Expense | Accounting Standards Update 2017-17 | Pro Forma
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Defined benefit plans, non-service related costs				$ 28	$ 24