Financial Instruments and Risk Management (Details) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) Debt_Instrument	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Early Repayment of Senior Debt		$ 2,500
Venezuela trade receivables exchanged for promissory note	$ 200	200
Repayments of Senior Debt		600
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Fair value of marketable securities		$ 92	$ 96
Foreign Currency Derivatives [Abstract]
Maximum term of currency derivative instruments (in years)		1 year
Long-term Debt and Capital Lease Obligations, Including Current Maturities		$ 12,377	15,346
Long-term Debt			15,346
Long-term Debt, Current Maturities		$ (163)	(659)
Interest Rate Derivatives [Abstract]
Number of debt instruments with related interest rate swaps | Debt_Instrument		3
Floating rate basis		LIBOR-based
Weighted average floating rate (percentage)		4.50%
Aggregate fixed rate debt after effect of interest rate swaps		$ 10,900
Aggregate floating rate debt after effect of interest rate swaps		1,500
Long-term Debt, Excluding Current Maturities		12,214	14,687
Long-term Debt, Percentage Bearing Fixed Interest, Amount		$ 12,377	15,346
Available-for-sale Securities, Debt Maturities, Date		May 01, 2019
Venezuela promissory note loss	$ 148	$ 148	0	$ 0
Promissory note fair value		70
Promissory note fair value, current		29
Promissory note fair value, noncurrent		41
Estimate of Fair Value, Fair Value Disclosure
Interest Rate Derivatives [Abstract]
Long-term debt		13,565	15,956
Estimate of Fair Value, Fair Value Disclosure | Level 1
Interest Rate Derivatives [Abstract]
Long-term debt		753	1,009
Estimate of Fair Value, Fair Value Disclosure | Level 2
Interest Rate Derivatives [Abstract]
Long-term debt		12,812	14,947
Carrying (Reported) Amount, Fair Value Disclosure
Foreign Currency Derivatives [Abstract]
Long-term Debt		12,377	15,346
Other current assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available-for-sale securities, current		56	63
Other assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available-for-sale securities, noncurrent		36	33
Interest Rate Swap [Member]
Foreign Currency Derivatives [Abstract]
Derivative, Notional Amount		1,500
Foreign Exchange Contract [Member]
Foreign Currency Derivatives [Abstract]
Derivative, Notional Amount		$ 603	$ 619
UNITED STATES | Geographic Concentration Risk | Accounts Receivable
Interest Rate Derivatives [Abstract]
Concentration Risk, Percentage (in hundredths)		28.00%	26.00%