Segments and Geographic Information Segment and Geographic Information (Assets, Depreciation and Amortization and Capital Expenditures ) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total Assets	$ 36,850	$ 38,966	$ 40,411
Depreciation and Amortization	1,144	1,245	1,294
Capital Expenditures	2,458	2,544	2,579
Interest Income	524	365	275
Interest Expense	1,436	1,471	1,482
Investments in and Advances to Affiliates	610	537	1,010
Equity in Earnings (Losses)	105	19	25
US SBU
Segment Reporting Information [Line Items]
Total Assets	9,844	10,062	9,952
Depreciation and Amortization	443	450	440
Capital Expenditures	861	534	426
Interest Income	0	0	0
Interest Expense	262	285	290
Investments in and Advances to Affiliates	1	1	1
Equity in Earnings (Losses)	0	0	0
Andes SBU
Segment Reporting Information [Line Items]
Total Assets	8,744	7,888	7,356
Depreciation and Amortization	175	182	186
Capital Expenditures	949	702	471
Interest Income	77	87	37
Interest Expense	154	160	135
Investments in and Advances to Affiliates	345	287	248
Equity in Earnings (Losses)	83	42	44
Brazil SBU
Segment Reporting Information [Line Items]
Total Assets	6,422	8,439	8,388
Depreciation and Amortization	185	260	259
Capital Expenditures	299	416	588
Interest Income	299	249	210
Interest Expense	349	331	364
Investments in and Advances to Affiliates	0	0	0
Equity in Earnings (Losses)	0	0	0
MCAC SBU (El Salvador)
Segment Reporting Information [Line Items]
Total Assets	4,830	4,948	5,075
Depreciation and Amortization	155	144	145
Capital Expenditures	201	192	111
Interest Income	30	26	20
Interest Expense	179	178	138
Investments in and Advances to Affiliates	0	0	0
Equity in Earnings (Losses)	0	0	4
Europe SBU
Segment Reporting Information [Line Items]
Total Assets	3,127	3,525	4,191
Depreciation and Amortization	134	154	155
Capital Expenditures	118	228	341
Interest Income	1	1	2
Interest Expense	73	98	80
Investments in and Advances to Affiliates	53	54	286
Equity in Earnings (Losses)	10	(25)	(5)
Asia SBU
Segment Reporting Information [Line Items]
Total Assets	3,197	2,972	2,810
Depreciation and Amortization	32	32	33
Capital Expenditures	13	429	576
Interest Income	115	2	6
Interest Expense	85	25	30
Investments in and Advances to Affiliates	195	194	186
Equity in Earnings (Losses)	8	10	10
Assets held-for-sale
Segment Reporting Information [Line Items]
Total Assets	96	0	1,718
Depreciation and Amortization	0		55
Depreciation Expense on Reclassified Assets		(1)
Capital Expenditures	0	13	52
Corporate and Other
Segment Reporting Information [Line Items]
Total Assets	590	1,132	921
Depreciation and Amortization	20	24	21
Capital Expenditures	17	30	14
Interest Income	2	0	0
Interest Expense	334	394	445
Investments in and Advances to Affiliates	16	1	289
Equity in Earnings (Losses)	$ 4	$ (8)	$ (28)