Carrying value as of the balance sheet date of obligations incurred and payable for statutory payroll taxes incurred through that date and withheld from employees pertaining to services received from them, including entity's matching share of the employees FICA taxes and contributions to the state and federal unemployment insurance programs. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Description of Business and Basis of Consolidation and Presentation (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income tax expense reduction	$ (120)		$ (67)
Segment Reporting [Abstract]
Number of reportable segments \| segment	3
Supplemental Cash Flow Elements [Abstract]
Dividends payable	$ 283		259
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued Liabilities Related To Tax Withholding For Settlements Of Share-based Compensation	$ 40		$ 26
Initial Recognition of Global Intangible Low-taxed Income of Foreign Subsidiaries
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income tax expense reduction		$ 35