Fair Value Measurements, Assets and Liabilities (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Assets [Abstract]
Cash equivalents	$ 36	$ 22
Bank time deposits	2	2
Investments in mutual funds and other similar instruments	13	13
Warrants	2	2
Insurance contracts	115	116
Derivative contracts	7	10
Total Assets	175	165
Liabilities [Abstract]
Derivative contracts	165	139
Contingent consideration	41	35
Total Liabilities	206	174
Quoted Prices in Active Markets (Level I) [Member]
Assets [Abstract]
Cash equivalents	36	22
Bank time deposits	2	2
Investments in mutual funds and other similar instruments	13	13
Total Assets	51	37
Significant Other Observable Inputs (Level 2) [Member]
Assets [Abstract]
Warrants	2	2
Insurance contracts	115	116
Derivative contracts	7	10
Total Assets	124	128
Liabilities [Abstract]
Derivative contracts	165	139
Total Liabilities	165	139
Significant Unobservable Inputs (Level 3) [Member]
Liabilities [Abstract]
Contingent consideration	41	35
Total Liabilities	$ 41	$ 35