Segments and Geographic Information Segment and Geographic Information (Assets, Depreciation and Amortization and Capital Expenditures ) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total Assets	$ 36,119	$ 36,470	$ 38,562
Depreciation and Amortization	1,176	1,144	1,245
Capital Expenditures	2,458	2,458	2,544
Interest Income	464	460	320
Interest Expense	1,431	1,344	1,451
Investments in and Advances to Affiliates	621	610	537
Net Equity in Earnings of Affiliates	36	105	19
Operating Segments [Member] | US SBU
Segment Reporting Information [Line Items]
Total Assets	9,333	9,800	10,019
Depreciation and Amortization	471	443	450
Capital Expenditures	809	861	534
Interest Income	0	0	0
Interest Expense	236	262	285
Investments in and Advances to Affiliates	23	1	1
Net Equity in Earnings of Affiliates	9	0	0
Operating Segments [Member] | Andes SBU
Segment Reporting Information [Line Items]
Total Assets	8,971	8,594	7,741
Depreciation and Amortization	218	175	182
Capital Expenditures	538	949	702
Interest Income	57	77	87
Interest Expense	178	154	160
Investments in and Advances to Affiliates	363	345	287
Net Equity in Earnings of Affiliates	15	83	42
Operating Segments [Member] | Brazil SBU
Segment Reporting Information [Line Items]
Total Assets	6,448	5,209	6,830
Depreciation and Amortization	145	145	210
Capital Expenditures	264	224	317
Interest Income	257	235	204
Interest Expense	365	257	311
Investments in and Advances to Affiliates	0	0	0
Net Equity in Earnings of Affiliates	0	0	0
Operating Segments [Member] | MCAC SBU
Segment Reporting Information [Line Items]
Total Assets	5,162	4,820	4,924
Depreciation and Amortization	165	155	144
Capital Expenditures	480	201	192
Interest Income	11	30	26
Interest Expense	163	179	178
Investments in and Advances to Affiliates	(1)	0	0
Net Equity in Earnings of Affiliates	(2)	0	0
Operating Segments [Member] | Europe SBU
Segment Reporting Information [Line Items]
Total Assets	2,664	3,101	3,491
Depreciation and Amortization	116	134	154
Capital Expenditures	143	118	228
Interest Income	5	1	1
Interest Expense	68	73	98
Investments in and Advances to Affiliates	41	53	54
Net Equity in Earnings of Affiliates	10	10	(25)
Operating Segments [Member] | Asia SBU
Segment Reporting Information [Line Items]
Total Assets	3,113	3,099	2,883
Depreciation and Amortization	33	32	32
Capital Expenditures	136	13	429
Interest Income	134	115	2
Interest Expense	111	85	25
Investments in and Advances to Affiliates	195	195	194
Net Equity in Earnings of Affiliates	3	8	10
Segment Reconciling Items [Member] | Assets held-for-sale
Segment Reporting Information [Line Items]
Total Assets	0	1,306	1,603
Depreciation and Amortization	16	40	49
Capital Expenditures	70	75	112
Corporate, Non-Segment [Member] | Corporate and Other
Segment Reporting Information [Line Items]
Total Assets	428	541	1,071
Depreciation and Amortization	12	20	24
Capital Expenditures	18	17	30
Interest Income	0	2	0
Interest Expense	310	334	394
Investments in and Advances to Affiliates	0	16	1
Net Equity in Earnings of Affiliates	$ 1	$ 4	$ (8)