Fair Value Measurements (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Assets:
Investments	$ 10	$ 11
Foreign Exchange Contracts	6	11
Total Assets at Fair Value	16	22
Liabilities:
Foreign Exchange Contracts	22	19
Total Liabilities at Fair Value	22	19
Supplemental Fair Value Information
Carrying amount — liability	6,023	5,066
Notes Payable and Overdrafts	712	348
Fixed Rate Debt, Excluding Capital Leases
Supplemental Fair Value Information
Carrying amount — liability	4,299	3,434
Fair value — liability	4,196	3,558
Notes Payable and Overdrafts	316	143
Variable Rate Debt, Excluding Capital Leases
Supplemental Fair Value Information
Carrying amount — liability	1,724	1,632
Fair value — liability	1,626	1,632
Notes Payable and Overdrafts	396	205
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1)
Assets:
Investments	10	11
Foreign Exchange Contracts	0	0
Total Assets at Fair Value	10	11
Liabilities:
Foreign Exchange Contracts	0	0
Total Liabilities at Fair Value	0	0
Supplemental Fair Value Information
Fair value — liability	4,364	3,808
Significant Other Observable Inputs (Level 2)
Assets:
Investments	0	0
Foreign Exchange Contracts	6	11
Total Assets at Fair Value	6	11
Liabilities:
Foreign Exchange Contracts	22	19
Total Liabilities at Fair Value	22	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