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Nature of Operations and Basis of Presentation (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Equity investments not accounted for under the equity method of accounting | $ 528 |  |  |
Interest income and other non-operating income, net | 161 | $ 85 |  |
Decrease to Operating income | $ (2,745) | $ (1,972) |  |
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, net |  |  | $ 1,200 | $ 380
Decrease to Operating income |  |  | $ 1,200 | $ 380

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