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Nature of Operations and Basis of Presentation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Interest income and other non-operating income (loss), net | $ (49) | $ 133 | $ 112 | $ 186 |  |
Decrease to Operating income | (2,618) | $ (2,972) | (5,522) | $ (5,063) |  |
Accounting Standards Update 2014-09 [Member] | Minimum [Member] | Forecast [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax |  |  |  |  |  | $ 500
Accounting Standards Update 2014-09 [Member] | Maximum [Member] | Forecast [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax |  |  |  |  |  | $ 1,000
Accounting Standards Update 2016-01 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Equity investments not accounted for under the equity method of accounting | $ 500 |  | $ 500 |  |  |
Accounting Standards Update 2017-07 [Member] | Pro Forma [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Interest income and other non-operating income (loss), net |  |  |  |  | $ 1,300 |
Decrease to Operating income |  |  |  |  | $ 1,300 |

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