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New Accounting Standards (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Operating expenses | [1] | $ (4,985) | $ (4,849) | $ (14,899) | $ (14,021)
Selling, general and administrative expenses | [1] | (1,018) | $ (1,107) | (2,758) | (2,848)
Pro Forma | Minimum |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Operating lease, right-of-use asset |  | 3,000 |  | 3,000 |
Operating lease, liability |  | 3,000 |  | 3,000 |
Pro Forma | Maximum |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Operating lease, right-of-use asset |  | 4,000 |  | 4,000 |
Operating lease, liability |  | $ 4,000 |  | $ 4,000 |
Accounting Standards Update 2017-07 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Operating expenses |  |  |  |  | 234
Selling, general and administrative expenses |  |  |  |  | $ 251
[1] | 2017 adjusted to conform to ASU 2017-07. Refer to Note 5, "New Accounting Standards" beginning on page 10.

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