Fair Value Measurements, Assets and Liabilities (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Assets [Abstract]
Cash equivalents	$ 22	$ 65
Bank time deposits	2	2
Investments in mutual funds and other similar instruments	13	15
Warrants	2	2
Insurance contracts	116	102
Derivative contracts	10	16
Total Assets	165	202
Liabilities [Abstract]
Derivative contracts	139	122
Contingent consideration	35	3
Total Liabilities	174	125
Quoted Prices in Active Markets (Level I) [Member]
Assets [Abstract]
Cash equivalents	22	65
Bank time deposits	2	2
Investments in mutual funds and other similar instruments	13	15
Total Assets	37	82
Significant Other Observable Inputs (Level 2) [Member]
Assets [Abstract]
Warrants	2	2
Insurance contracts	116	102
Derivative contracts	10	16
Total Assets	128	120
Liabilities [Abstract]
Derivative contracts	139	122
Total Liabilities	139	122
Significant Unobservable Inputs (Level 3) [Member]
Liabilities [Abstract]
Contingent consideration	35	3
Total Liabilities	$ 35	$ 3