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Summary of Significant Accounting Policies Adoption of ASU (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect |  | $ 3,005 | $ (461) | $ 498
Accrued contingencies and other current liabilities |  | 73 | 138 | 11
Other, net |  | 0 | 4 | 1
Impact of adoption of ASUs | $ 66 | (109) |  |
Accounting Standards Update 2017-05 [Member] | Other Long-Term Liabilities and Deferred Credits [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
EIG's cumulative contribution to ELC |  |  | 485 |
Other Nonoperating Income (Expense) [Member] | Accounting Standards Update 2017-07 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Impact of adoption of ASUs |  |  | 15 | 34
General and Administrative Expense [Member] | Accounting Standards Update 2017-07 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Impact of adoption of ASUs |  |  | (15) | (34)
Accumulated other comprehensive loss |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Impact of adoption of ASUs | (109) |  |  |
Accumulated other comprehensive loss | Accounting Standards Update 2018-02 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Impact of adoption of ASUs |  | (109) |  |
Retained deficit |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Impact of adoption of ASUs | $ 175 |  |  |
Retained deficit | Accounting Standards Update 2017-05 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Impact of adoption of ASUs |  | 66 |  |
Retained deficit | Accounting Standards Update 2018-02 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Impact of adoption of ASUs |  | $ 109 |  |
Accounting Standards Update 2016-18 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect |  |  | 41 | (43)
Accrued contingencies and other current liabilities |  |  | 0 | (37)
Other, net |  |  | $ (41) | $ 80

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