Fair Value Measurements (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Assets:
Investments	$ 11	$ 10
Foreign Exchange Contracts	11	18
Total Assets at Fair Value	22	28
Liabilities:
Foreign Exchange Contracts	19	7
Total Liabilities at Fair Value	19	7
Supplemental Fair Value Information
Carrying amount — liability	5,066	5,316
Notes payable and overdrafts	348	410
Fixed Rate Debt, Excluding Capital Leases
Supplemental Fair Value Information
Carrying amount — liability	3,434	3,609
Fair value — liability	3,558	3,443
Notes payable and overdrafts	143	230
Variable Rate Debt, Excluding Capital Leases
Supplemental Fair Value Information
Carrying amount — liability	1,632	1,707
Fair value — liability	1,632	1,689
Notes payable and overdrafts	205	180
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1)
Assets:
Investments	11	10
Foreign Exchange Contracts	0	0
Total Assets at Fair Value	11	10
Liabilities:
Foreign Exchange Contracts	0	0
Total Liabilities at Fair Value	0	0
Supplemental Fair Value Information
Fair value — liability	3,808	3,496
Significant Other Observable Inputs (Level 2)
Assets:
Investments	0	0
Foreign Exchange Contracts	11	18
Total Assets at Fair Value	11	18
Liabilities:
Foreign Exchange Contracts	19	7
Total Liabilities at Fair Value	19	7
Significant Unobservable Inputs (Level 3)
Assets:
Investments	0	0
Foreign Exchange Contracts	0	0
Total Assets at Fair Value	0	0
Liabilities:
Foreign Exchange Contracts	0	0
Total Liabilities at Fair Value	$ 0	$ 0