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Segments and Geographic Information Segment and Geographic Information (Assets, Depreciation and Amortization and Capital Expenditures ) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Total Assets | $ 32,521 | $ 33,112 | $ 36,124
Depreciation and Amortization | 1,003 | 1,169 | 1,176
Capital Expenditures | 2,396 | 2,356 | 2,458
Interest Income | 310 | 244 | 245
Interest Expense | 1,056 | 1,170 | 1,134
Investments in and Advances to Affiliates | 1,114 | 1,197 | 621
Net Equity in Earnings of Affiliates | 39 | 71 | 36
Operating Segments [Member] | US and Utilities SBU |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Assets | 12,286 | 11,548 | 10,815
Depreciation and Amortization | 449 | 487 | 519
Capital Expenditures | 1,373 | 905 | 858
Interest Income | 10 | 5 | 4
Interest Expense | 287 | 315 | 299
Investments in and Advances to Affiliates | 538 | 535 | 23
Net Equity in Earnings of Affiliates | 35 | 41 | 9
Operating Segments [Member] | Andes SBU |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Assets | 10,941 | 11,126 | 10,487
Depreciation and Amortization | 300 | 301 | 251
Capital Expenditures | 662 | 477 | 569
Interest Income | 92 | 95 | 95
Interest Expense | 283 | 297 | 247
Investments in and Advances to Affiliates | 213 | 358 | 363
Net Equity in Earnings of Affiliates | 15 | 28 | 15
Operating Segments [Member] | MCAC SBU |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Assets | 4,462 | 4,087 | 3,680
Depreciation and Amortization | 141 | 122 | 117
Capital Expenditures | 302 | 435 | 431
Interest Income | 20 | 13 | 7
Interest Expense | 124 | 111 | 100
Investments in and Advances to Affiliates | 5 | (5) | (1)
Net Equity in Earnings of Affiliates | (7) | (4) | (2)
Operating Segments [Member] | EURASIA [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Assets | 4,538 | 6,002 | 5,777
Depreciation and Amortization | 99 | 127 | 149
Capital Expenditures | 51 | 211 | 279
Interest Income | 186 | 130 | 139
Interest Expense | 145 | 167 | 179
Investments in and Advances to Affiliates | 293 | 307 | 236
Net Equity in Earnings of Affiliates | 14 | 9 | 13
Segment Reconciling Items [Member] | Assets held-for-sale |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Assets | 0 | 86 | 4,936
Depreciation and Amortization | 0 | 123 | 128
Capital Expenditures | 0 | 315 | 303
Corporate, Non-Segment [Member] | Corporate, Other and Eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Assets | 294 | 263 | 429
Depreciation and Amortization | 14 | 9 | 12
Capital Expenditures | 8 | 13 | 18
Interest Income | 2 | 1 | 0
Interest Expense | 217 | 280 | 309
Investments in and Advances to Affiliates | 65 | 2 | 0
Net Equity in Earnings of Affiliates | $ (18) | $ (3) | $ 1

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