Fair Value Measurements, Assets and Liabilities (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Assets [Abstract]
Cash equivalents	$ 52	$ 22
Bank time deposits	2	2
Investments in mutual funds and other similar instruments	13	13
Warrants	4	2
Insurance contracts	116	116
Derivative contracts	9	10
Total Assets	196	165
Liabilities [Abstract]
Derivative contracts	176	139
Contingent consideration	40	35
Total Liabilities	216	174
Quoted Prices in Active Markets (Level I) [Member]
Assets [Abstract]
Cash equivalents	52	22
Bank time deposits	2	2
Investments in mutual funds and other similar instruments	13	13
Total Assets	67	37
Significant Other Observable Inputs (Level 2) [Member]
Assets [Abstract]
Warrants	4	2
Insurance contracts	116	116
Derivative contracts	9	10
Total Assets	129	128
Liabilities [Abstract]
Derivative contracts	176	139
Total Liabilities	176	139
Significant Unobservable Inputs (Level 3) [Member]
Liabilities [Abstract]
Contingent consideration	40	35
Total Liabilities	$ 40	$ 35