Fair Value Measurements (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Assets:
Investments	$ 9	$ 11
Foreign Exchange Contracts	54	11
Total Assets at Fair Value	63	22
Liabilities:
Foreign Exchange Contracts	8	19
Total Liabilities at Fair Value	8	19
Supplemental Fair Value Information
Carrying amount — liability	5,586	5,066
Notes Payable and Overdrafts	691	348
Fixed Rate Debt, Excluding Capital Leases
Supplemental Fair Value Information
Carrying amount — liability	3,436	3,434
Fair value — liability	3,111	3,558
Notes Payable and Overdrafts	199	143
Variable Rate Debt, Excluding Capital Leases
Supplemental Fair Value Information
Carrying amount — liability	2,150	1,632
Fair value — liability	1,889	1,632
Notes Payable and Overdrafts	492	205
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1)
Assets:
Investments	9	11
Foreign Exchange Contracts	0	0
Total Assets at Fair Value	9	11
Liabilities:
Foreign Exchange Contracts	0	0
Total Liabilities at Fair Value	0	0
Supplemental Fair Value Information
Fair value — liability	3,300	3,808
Significant Other Observable Inputs (Level 2)
Assets:
Investments	0	0
Foreign Exchange Contracts	54	11
Total Assets at Fair Value	54	11
Liabilities:
Foreign Exchange Contracts	8	19
Total Liabilities at Fair Value	8	19
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