Consolidating Financial Information - Condensed Consolidating Statement of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended			52 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017
Cash Flows from Operating Activities:
Total Cash Flows from Operating Activities	$ 1,158	$ 1,557	$ 1,728
Cash Flows from Investing Activities:
Capital Expenditures	(881)	(996)	(983)
Asset Dispositions	12	35	62
Decrease in Cash Due to Deconsolidation of Venezuelan Subsidiary	0	0	(320)
Short Term Securities Acquired	(83)	(72)	(77)
Short Term Securities Redeemed	83	60	69
Capital Contributions Received and Loans Incurred	0	0	0
Capital Redemptions and Loans Paid	0	0	0
Other Transactions	(10)	(6)	(7)
Total Cash Flows from Investing Activities	(879)	(979)	(1,256)
Cash Flows from Financing Activities:
Short Term Debt and Overdrafts Incurred	1,054	417	103
Short Term Debt and Overdrafts Paid	(1,046)	(228)	(84)
Long Term Debt Incurred	6,463	4,988	2,819
Long Term Debt Paid	(6,342)	(5,433)	(3,315)
Common Stock Issued	14	13	53
Common Stock Repurchased	(400)	(500)	(180)	$ (1,313)
Common Stock Dividends Paid	(110)	(82)	(68)
Capital Contributions Received and Loans Incurred	0	0	0
Capital Redemptions and Loans Paid	0	0	0
Intercompany Dividends Paid	0	0	0
Transactions with Minority Interests in Subsidiaries	(7)	(11)	(9)
Debt Related Costs and Other Transactions	(41)	(40)	(74)
Dissolution of Global Alliance	0	0	(271)
Total Cash Flows from Financing Activities	(415)	(876)	(1,026)
Effect of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash	57	(15)	(125)
Net Change in Cash, Cash Equivalents and Restricted Cash	(79)	(313)	(679)
Cash, Cash Equivalents and Restricted Cash at Beginning of the Year	1,189	1,502	2,181
Cash, Cash Equivalents and Restricted Cash at End of the Year	1,110	1,189	1,502	1,110
Reportable Legal Entities | Parent Company
Cash Flows from Operating Activities:
Total Cash Flows from Operating Activities	1,192	609	1,043
Cash Flows from Investing Activities:
Capital Expenditures	(305)	(370)	(322)
Asset Dispositions	1	11	48
Decrease in Cash Due to Deconsolidation of Venezuelan Subsidiary			0
Short Term Securities Acquired	0	0	0
Short Term Securities Redeemed	0	0	0
Capital Contributions Received and Loans Incurred	(79)	(257)	(70)
Capital Redemptions and Loans Paid	76	163	122
Other Transactions	(3)	0	0
Total Cash Flows from Investing Activities	(310)	(453)	(222)
Cash Flows from Financing Activities:
Short Term Debt and Overdrafts Incurred	420	0	39
Short Term Debt and Overdrafts Paid	(420)	0	(15)
Long Term Debt Incurred	3,062	2,896	1,736
Long Term Debt Paid	(3,151)	(3,016)	(2,341)
Common Stock Issued	14	13	53
Common Stock Repurchased	(400)	(500)	(180)
Common Stock Dividends Paid	(110)	(82)	(68)
Capital Contributions Received and Loans Incurred	292	576	90
Capital Redemptions and Loans Paid	(563)	(148)	(125)
Intercompany Dividends Paid	0	0	0
Transactions with Minority Interests in Subsidiaries	0	0	0
Debt Related Costs and Other Transactions	(35)	(46)	(59)
Dissolution of Global Alliance			(271)
Total Cash Flows from Financing Activities	(891)	(307)	(1,141)
Effect of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash	0	0	0
Net Change in Cash, Cash Equivalents and Restricted Cash	(9)	(151)	(320)
Cash, Cash Equivalents and Restricted Cash at Beginning of the Year	210	361	681
Cash, Cash Equivalents and Restricted Cash at End of the Year	201	210	361	201
Reportable Legal Entities | Guarantor Subsidiaries
Cash Flows from Operating Activities:
Total Cash Flows from Operating Activities	67	135	126
Cash Flows from Investing Activities:
Capital Expenditures	(136)	(107)	(112)
Asset Dispositions	1	0	0
Decrease in Cash Due to Deconsolidation of Venezuelan Subsidiary			0
Short Term Securities Acquired	0	0	0
Short Term Securities Redeemed	0	0	0
Capital Contributions Received and Loans Incurred	0	0	0
Capital Redemptions and Loans Paid	0	0	0
Other Transactions	0	0	0
Total Cash Flows from Investing Activities	(135)	(107)	(112)
Cash Flows from Financing Activities:
Short Term Debt and Overdrafts Incurred	0	0	0
Short Term Debt and Overdrafts Paid	0	0	0
Long Term Debt Incurred	204	0	0
Long Term Debt Paid	(52)	0	0
Common Stock Issued	0	0	0
Common Stock Repurchased	0	0	0
Common Stock Dividends Paid	0	0	0
Capital Contributions Received and Loans Incurred	66	59	12
Capital Redemptions and Loans Paid	(48)	(80)	(15)
Intercompany Dividends Paid	(128)	(19)	(17)
Transactions with Minority Interests in Subsidiaries	0	0	0
Debt Related Costs and Other Transactions	0	0	0
Dissolution of Global Alliance			0
Total Cash Flows from Financing Activities	42	(40)	(20)
Effect of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash	3	0	(13)
Net Change in Cash, Cash Equivalents and Restricted Cash	(23)	(12)	(19)
Cash, Cash Equivalents and Restricted Cash at Beginning of the Year	55	67	86
Cash, Cash Equivalents and Restricted Cash at End of the Year	32	55	67	32
Reportable Legal Entities | Non-Guarantor Subsidiaries
Cash Flows from Operating Activities:
Total Cash Flows from Operating Activities	577	885	612
Cash Flows from Investing Activities:
Capital Expenditures	(442)	(525)	(558)
Asset Dispositions	10	24	14
Decrease in Cash Due to Deconsolidation of Venezuelan Subsidiary			(320)
Short Term Securities Acquired	(83)	(72)	(77)
Short Term Securities Redeemed	83	60	69
Capital Contributions Received and Loans Incurred	(292)	(576)	(90)
Capital Redemptions and Loans Paid	563	148	125
Other Transactions	(7)	(6)	(7)
Total Cash Flows from Investing Activities	(168)	(947)	(844)
Cash Flows from Financing Activities:
Short Term Debt and Overdrafts Incurred	634	417	118
Short Term Debt and Overdrafts Paid	(626)	(228)	(123)
Long Term Debt Incurred	3,197	2,092	1,083
Long Term Debt Paid	(3,139)	(2,417)	(974)
Common Stock Issued	0	0	0
Common Stock Repurchased	0	0	0
Common Stock Dividends Paid	0	0	0
Capital Contributions Received and Loans Incurred	13	198	58
Capital Redemptions and Loans Paid	(28)	(83)	(107)
Intercompany Dividends Paid	(548)	(47)	(27)
Transactions with Minority Interests in Subsidiaries	(7)	(11)	(9)
Debt Related Costs and Other Transactions	(6)	6	(15)
Dissolution of Global Alliance			0
Total Cash Flows from Financing Activities	(510)	(73)	4
Effect of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash	54	(15)	(112)
Net Change in Cash, Cash Equivalents and Restricted Cash	(47)	(150)	(340)
Cash, Cash Equivalents and Restricted Cash at Beginning of the Year	924	1,074	1,414
Cash, Cash Equivalents and Restricted Cash at End of the Year	877	924	1,074	877
Consolidating Entries and Eliminations
Cash Flows from Operating Activities:
Total Cash Flows from Operating Activities	(678)	(72)	(53)
Cash Flows from Investing Activities:
Capital Expenditures	2	6	9
Asset Dispositions	0	0	0
Decrease in Cash Due to Deconsolidation of Venezuelan Subsidiary			0
Short Term Securities Acquired	0	0	0
Short Term Securities Redeemed	0	0	0
Capital Contributions Received and Loans Incurred	371	833	160
Capital Redemptions and Loans Paid	(639)	(311)	(247)
Other Transactions	0	0	0
Total Cash Flows from Investing Activities	(266)	528	(78)
Cash Flows from Financing Activities:
Short Term Debt and Overdrafts Incurred	0	0	(54)
Short Term Debt and Overdrafts Paid	0	0	54
Long Term Debt Incurred	0	0	0
Long Term Debt Paid	0	0	0
Common Stock Issued	0	0	0
Common Stock Repurchased	0	0	0
Common Stock Dividends Paid	0	0	0
Capital Contributions Received and Loans Incurred	(371)	(833)	(160)
Capital Redemptions and Loans Paid	639	311	247
Intercompany Dividends Paid	676	66	44
Transactions with Minority Interests in Subsidiaries	0	0	0
Debt Related Costs and Other Transactions	0	0	0
Dissolution of Global Alliance			0
Total Cash Flows from Financing Activities	944	(456)	131
Effect of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash	0	0	0
Net Change in Cash, Cash Equivalents and Restricted Cash	0	0	0
Cash, Cash Equivalents and Restricted Cash at Beginning of the Year	0	0	0
Cash, Cash Equivalents and Restricted Cash at End of the Year	$ 0	$ 0	$ 0	$ 0