Financial Instruments and Fair Value Measurements (Fair Value of Assets and Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Assets:
Equity securities	$ 32
Marketable securities		$ 146
Foreign currency hedges	4	13
Total Assets	36	159
Liabilities:
Deferred compensation	472	490
Foreign currency hedges	19	14
Total Liabilities	491	504
Level 1 [Member]
Assets:
Equity securities	0
Marketable securities		146
Foreign currency hedges	0	0
Total Assets	0	146
Liabilities:
Deferred compensation	0	0
Foreign currency hedges	0	0
Total Liabilities	0	0
Level 2 [Member]
Assets:
Equity securities	32
Marketable securities		0
Foreign currency hedges	4	13
Total Assets	36	13
Liabilities:
Deferred compensation	472	490
Foreign currency hedges	19	14
Total Liabilities	491	504
Level 3 [Member]
Assets:
Equity securities	0
Marketable securities		0
Foreign currency hedges	0	0
Total Assets	0	0
Liabilities:
Deferred compensation	0	0
Foreign currency hedges	0	0
Total Liabilities	$ 0	$ 0