Fair Value Measurements (Details BS Table) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Derivatives Fair Value [Line Items]
Cash	$ 133	$ 167
Available-for-sale Securities	0	15
Derivative Instruments in Hedges, Liabilities, at Fair Value	49	69
Derivative Liabilities	80	90
Debt Instrument, Fair Value Disclosure	7,239	5,945
Designated as Hedging Instrument [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	237	64
Designated as Hedging Instrument [Member] \| Prepaid Expenses and Other Current Assets [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	55
Designated as Hedging Instrument [Member] \| Other Current Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments in Hedges, Liabilities, at Fair Value	2	37
Designated as Hedging Instrument [Member] \| Other Noncurrent Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments in Hedges, Liabilities, at Fair Value		33
Designated as Hedging Instrument [Member] \| Other Noncurrent Assets [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	183
Not Designated as Hedging Instrument [Member]
Derivatives Fair Value [Line Items]
Derivative Asset	304	82
Not Designated as Hedging Instrument [Member] \| Prepaid Expenses and Other Current Assets [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	67	18
Not Designated as Hedging Instrument [Member] \| Other Current Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	31	21
Currency hedge contracts [Member] \| Designated as Hedging Instrument [Member] \| Prepaid Expenses and Other Current Assets [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value		7
Currency hedge contracts [Member] \| Designated as Hedging Instrument [Member] \| Other Noncurrent Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments in Hedges, Liabilities, at Fair Value	3
Currency hedge contracts [Member] \| Designated as Hedging Instrument [Member] \| Other Long Term Assets [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value		57
Interest Rate Swap [Member] \| Designated as Hedging Instrument [Member] \| Other Current Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments in Hedges, Liabilities, at Fair Value	44	0
Fair Value, Measurements, Recurring [Member]
Derivatives Fair Value [Line Items]
Money Market Funds, at Carrying Value	13	21
Cash	304	82
Available-for-sale Securities	0	15
Accrued Contingent Consideration	347	169
Assets, Fair Value Disclosure	318	118
Foreign Currency Contracts, Liability, Fair Value Disclosure	80	90
Financial and Nonfinancial Liabilities, Fair Value Disclosure	427	259
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Derivatives Fair Value [Line Items]
Money Market Funds, at Carrying Value	13	21
Cash	0	0
Available-for-sale Securities	0	15
Accrued Contingent Consideration	0	0
Assets, Fair Value Disclosure	14	36
Foreign Currency Contracts, Liability, Fair Value Disclosure	0	0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Derivatives Fair Value [Line Items]
Money Market Funds, at Carrying Value	0	0
Cash	0	0
Available-for-sale Securities	0	0
Accrued Contingent Consideration	347	169
Assets, Fair Value Disclosure	0	0
Foreign Currency Contracts, Liability, Fair Value Disclosure	0	0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	347	169
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Derivatives Fair Value [Line Items]
Money Market Funds, at Carrying Value	0	0
Cash	304	82
Available-for-sale Securities	0	0
Accrued Contingent Consideration	0	0
Assets, Fair Value Disclosure	304	82
Foreign Currency Contracts, Liability, Fair Value Disclosure	80	90
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ 80	$ 90

Estimated discounted potential payments under contingent consideration arrangements.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value of financial and nonfinancial obligations.

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