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Segment and Geographic Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenue
Total Revenue	$ 17,274	$ 15,828	$ 13,110
Intersegment	0	0	0
Revenues	17,274	15,828	13,110
Reconciliation To Income From Continuing Operations Before Taxes
Depreciation and amortization	(1,209)	(1,064)	(908)
Interest expense	(1,603)	(1,503)	(1,461)
Interest income	400	408	344
Other expense	(156)	(234)	(104)
Other income	149	100	459
Gain on sale of investments	8	0	131
Goodwill impairment	(17)	(21)	(122)
Asset impairment expense	(225)	(389)	(20)
Foreign Currency Transaction Gains (Losses)	(38)	(33)	35
Other non-operating expense	(82)	(7)	(12)
Income from continuing operations before taxes and equity in earnings of affiliates	2,179	1,865	2,268
Segment Reporting Entity Other Disclosures [Abstract]
Assets	45,333	40,511	39,535
Depreciation and Amortization	1,262	1,178	1,049
Capital Expenditures	2,461	2,333	2,538
Investment in and advances to subsidiaries and affiliates	1,422	1,320	1,157
Equity in Earnings (Loss)	(2)	184	93
Office equipment, net	25,731	23,429
United States [Member]
Revenue
Total Revenue	2,256	2,095	1,987
Segment Reporting Entity Other Disclosures [Abstract]
Office equipment, net	8,448	6,027
Brazil [Member]
Revenue
Total Revenue	6,640	6,355	5,292
Segment Reporting Entity Other Disclosures [Abstract]
Office equipment, net	5,896	6,263
Chile [Member]
Revenue
Total Revenue	1,608	1,355	1,239
Segment Reporting Entity Other Disclosures [Abstract]
Office equipment, net	2,781	2,560
Argentina [Member]
Revenue
Total Revenue	979	771	571
Segment Reporting Entity Other Disclosures [Abstract]
Office equipment, net	279	270
El Salvador [Member]
Revenue
Total Revenue	752	648	619
Segment Reporting Entity Other Disclosures [Abstract]
Office equipment, net	268	261
Dominican Republic [Member]
Revenue
Total Revenue	674	535	429
Segment Reporting Entity Other Disclosures [Abstract]
Office equipment, net	662	625
Philippines [Member]
Revenue
Total Revenue	480	501	250
Segment Reporting Entity Other Disclosures [Abstract]
Office equipment, net	766	784
Cameroon [Member]
Revenue
Total Revenue	386	422	370
Segment Reporting Entity Other Disclosures [Abstract]
Office equipment, net	901	823
Spain [Member]
Revenue
Total Revenue	258	411	0
Segment Reporting Entity Other Disclosures [Abstract]
Office equipment, net	0	0
Mexico [Member]
Revenue
Total Revenue	404	409	329
Segment Reporting Entity Other Disclosures [Abstract]
Office equipment, net	774	786
Colombia [Member]
Revenue
Total Revenue	365	393	347
Segment Reporting Entity Other Disclosures [Abstract]
Office equipment, net	384	387
United Kingdom [Member]
Revenue
Total Revenue	587	364	228
Segment Reporting Entity Other Disclosures [Abstract]
Office equipment, net	523	507
Ukraine [Member]
Revenue
Total Revenue	418	356	286
Segment Reporting Entity Other Disclosures [Abstract]
Office equipment, net	94	86
Hungary [Member]
Revenue
Total Revenue	204	252	259
Segment Reporting Entity Other Disclosures [Abstract]
Office equipment, net	6	73
Puerto Rico [Member]
Revenue
Total Revenue	298	253	267
Segment Reporting Entity Other Disclosures [Abstract]
Office equipment, net	581	596
Panama [Member]
Revenue
Total Revenue	189	194	168
Segment Reporting Entity Other Disclosures [Abstract]
Office equipment, net	1,040	921
Kazakhstan [Member]
Revenue
Total Revenue	145	138	123
Segment Reporting Entity Other Disclosures [Abstract]
Office equipment, net	86	63
Jordan [Member]
Revenue
Total Revenue	124	120	104
Segment Reporting Entity Other Disclosures [Abstract]
Office equipment, net	216	224
Sri Lanka [Member]
Revenue
Total Revenue	140	100	109
Segment Reporting Entity Other Disclosures [Abstract]
Office equipment, net	22	69
Bulgaria [Member]
Revenue
Total Revenue	251	44	0
Segment Reporting Entity Other Disclosures [Abstract]
Office equipment, net	1,619	1,825
Qatar [Member]
Revenue
Total Revenue	0	0	0
Segment Reporting Entity Other Disclosures [Abstract]
Office equipment, net	0	0
Pakistan [Member]
Revenue
Total Revenue	0	0	0
Segment Reporting Entity Other Disclosures [Abstract]
Office equipment, net	0	0
Oman [Member]
Revenue
Total Revenue	0	0	0
Segment Reporting Entity Other Disclosures [Abstract]
Office equipment, net	0	0
Other Non US [Member]
Revenue
Total Revenue	116	112	133
Segment Reporting Entity Other Disclosures [Abstract]
Office equipment, net	385	279
Total Non US [Member]
Revenue
Total Revenue	15,018	13,733	11,123
Segment Reporting Entity Other Disclosures [Abstract]
Office equipment, net	17,283	17,402
Latin America Generation [Member]
Revenue
Total Revenue	4,982	4,281	3,651
Intersegment	(1,148)	(1,017)	(864)
Revenues	3,834	3,264	2,787
Adjusted Gross Margin
Adjusted Gross Margin	2,086	1,698	1,528
Intersegment	(1,090)	(1,010)	(852)
External Adjusted Gross Margin	996	688	676
Reconciliation To Income From Continuing Operations Before Taxes
Goodwill impairment	0	0
Segment Reporting Entity Other Disclosures [Abstract]
Assets	10,713	10,373	9,802
Depreciation and Amortization	261	215	183
Capital Expenditures	658	641	951
Investment in and advances to subsidiaries and affiliates	188	150	129
Equity in Earnings (Loss)	35	48	30
Latin America Utilities [Member]
Revenue
Total Revenue	7,374	6,987	5,877
Intersegment	0	0	0
Revenues	7,374	6,987	5,877
Adjusted Gross Margin
Adjusted Gross Margin	1,321	1,248	1,060
Intersegment	1,118	1,018	865
External Adjusted Gross Margin	2,439	2,266	1,925
Reconciliation To Income From Continuing Operations Before Taxes
Goodwill impairment	0	0
Segment Reporting Entity Other Disclosures [Abstract]
Assets	9,468	9,609	8,810
Depreciation and Amortization	293	231	201
Capital Expenditures	666	584	356
Investment in and advances to subsidiaries and affiliates	0	0	0
Equity in Earnings (Loss)	0	0	0
North America Generation [Member]
Revenue
Total Revenue	1,465	1,453	1,381
Intersegment	(4)	0	0
Revenues	1,461	1,453	1,381
Adjusted Gross Margin
Adjusted Gross Margin	533	540	537
Intersegment	9	2	(3)
External Adjusted Gross Margin	542	542	534
Reconciliation To Income From Continuing Operations Before Taxes
Goodwill impairment	0	18
Segment Reporting Entity Other Disclosures [Abstract]
Assets	4,326	4,519	4,914
Depreciation and Amortization	150	160	158
Capital Expenditures	64	71	64
Investment in and advances to subsidiaries and affiliates	18	0	3
Equity in Earnings (Loss)	(2)	(2)	(2)
North America Utilities [Member]
Revenue
Total Revenue	1,326	1,145	1,068
Intersegment	0	0	0
Revenues	1,326	1,145	1,068
Adjusted Gross Margin
Adjusted Gross Margin	394	407	401
Intersegment	1	2	2
External Adjusted Gross Margin	395	409	403
Reconciliation To Income From Continuing Operations Before Taxes
Goodwill impairment	0	0
Segment Reporting Entity Other Disclosures [Abstract]
Assets	9,384	3,139	3,035
Depreciation and Amortization	178	161	157
Capital Expenditures	232	177	116
Investment in and advances to subsidiaries and affiliates	0	0	0
Equity in Earnings (Loss)	0	0	0
Europe Generation [Member]
Revenue
Total Revenue	1,550	1,318	762
Intersegment	(2)	(2)	2
Revenues	1,548	1,316	764
Adjusted Gross Margin
Adjusted Gross Margin	469	395	273
Intersegment	8	3	4
External Adjusted Gross Margin	477	398	277
Reconciliation To Income From Continuing Operations Before Taxes
Goodwill impairment	0	0
Segment Reporting Entity Other Disclosures [Abstract]
Assets	3,276	3,317	3,147
Depreciation and Amortization	136	114	53
Capital Expenditures	140	233	212
Investment in and advances to subsidiaries and affiliates	479	353	308
Equity in Earnings (Loss)	8	19	50
Asia Generation [Member]
Revenue
Total Revenue	625	618	375
Intersegment	0	0	0
Revenues	625	618	375
Adjusted Gross Margin
Adjusted Gross Margin	176	255	111
Intersegment	2	2	4
External Adjusted Gross Margin	178	257	115
Reconciliation To Income From Continuing Operations Before Taxes
Goodwill impairment	17	0
Segment Reporting Entity Other Disclosures [Abstract]
Assets	1,717	1,762	1,594
Depreciation and Amortization	33	33	32
Capital Expenditures	129	10	22
Investment in and advances to subsidiaries and affiliates	291	409	390
Equity in Earnings (Loss)	(1)	3	28
Segment Discontinued Operations [Member]
Segment Reporting Entity Other Disclosures [Abstract]
Assets	829	1,844	3,023
Depreciation and Amortization	27	81	117
Capital Expenditures	66	88	100
Investment in and advances to subsidiaries and affiliates	0	0	0
Equity in Earnings (Loss)	0	0	0
Segment Discontinued Operations [Member] | United States [Member]
Revenue
Total Revenue	228	519	559
Segment Reporting Entity Other Disclosures [Abstract]
Assets		140
Segment Discontinued Operations [Member] | Brazil [Member]
Revenue
Total Revenue	124	118	102
Segment Reporting Entity Other Disclosures [Abstract]
Assets		151
Segment Discontinued Operations [Member] | Argentina [Member]
Revenue
Total Revenue	102	116	113
Segment Reporting Entity Other Disclosures [Abstract]
Assets		189
Segment Discontinued Operations [Member] | Spain [Member]
Segment Reporting Entity Other Disclosures [Abstract]
Assets	620	667
Segment Discontinued Operations [Member] | United Kingdom [Member]
Revenue
Total Revenue	17	21	11
Segment Reporting Entity Other Disclosures [Abstract]
Assets		20
Segment Discontinued Operations [Member] | Hungary [Member]
Revenue
Total Revenue	14	44	58
Segment Reporting Entity Other Disclosures [Abstract]
Assets		7
Segment Discontinued Operations [Member] | Qatar [Member]
Revenue
Total Revenue		129	163
Segment Discontinued Operations [Member] | Pakistan [Member]
Revenue
Total Revenue		299	470
Segment Discontinued Operations [Member] | Oman [Member]
Revenue
Total Revenue		62	101
Segment Discontinued Operations [Member] | Other Non US [Member]
Revenue
Total Revenue	1
Segment Reporting Entity Other Disclosures [Abstract]
Assets	2	18
Segment Discontinued Operations [Member] | Total Non US [Member]
Revenue
Total Revenue	258
Corporate Other And Other Eliminations [Member]
Revenue
Total Revenue	(48)	26	(4)
Intersegment	1,154	1,019	862
Revenues	1,106	1,045	858
Adjusted Gross Margin
Adjusted Gross Margin	(27)	65	16
Intersegment	(48)	(17)	(20)
External Adjusted Gross Margin	(75)	48	(4)
Reconciliation To Income From Continuing Operations Before Taxes
Goodwill impairment	0	3
Segment Reporting Entity Other Disclosures [Abstract]
Assets	5,620	5,948	5,210
Depreciation and Amortization	184	183	148
Capital Expenditures	506	529	717
Investment in and advances to subsidiaries and affiliates	446	408	327
Equity in Earnings (Loss)	$ (42)	$ 116	$ (13)

X

- Definition

The total cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows associated with the repayment of financed capital expenditures

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Amount of total adjusted gross margin for the reportable segment, including adjusted gross margin from external customers and transactions with other operating segments of the same entity. Adjusted gross margin is defined by the Company as: Gross Margin plus depreciation and amortization less general and administrative expenses.

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Amount of adjusted gross margin from external customers for the reportable segment. Must be disclosed if the amounts (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. Adjusted gross margin is defined by the Company as: Gross Margin plus depreciation and amortization less general and administrative expenses.

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