Financial Instruments and Fair Value Measurements (Fair Value of Assets and Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Assets:
Foreign currency hedges	$ 10	$ 15
Total Assets	10	15
Liabilities:
Deferred compensation	326	336
Foreign currency hedges	1	1
Total Liabilities	327	337
Level 1 [Member]
Assets:
Foreign currency hedges	0	0
Total Assets	0	0
Liabilities:
Deferred compensation	0	0
Foreign currency hedges	0	0
Total Liabilities	0	0
Level 2 [Member]
Assets:
Foreign currency hedges	10	15
Total Assets	10	15
Liabilities:
Deferred compensation	326	336
Foreign currency hedges	1	1
Total Liabilities	327	337
Level 3 [Member]
Assets:
Foreign currency hedges	0	0
Total Assets	0	0
Liabilities:
Deferred compensation	0	0
Foreign currency hedges	0	0
Total Liabilities	$ 0	$ 0