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Basis of Presentation and Principles of Consolidation (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Excess tax benefits recorded | $ 23 |
Diluted shares outstanding (in shares) | 170,246,947 | 168,368,444
Increase to cash provided by operating activities | $ 244 | $ 255
Decrease to cash provided by financing activities | $ 192 | (28)
Initial Listing Fees |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Listings estimated useful life | 6 years |
Additional Listing Fees |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Listings estimated useful life | 4 years |
Accounting Standards Update 2016-09, Excess Tax Benefit Component [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Diluted shares outstanding (in shares) | 834,311 |
Impact on diluted EPS (in dollars per share) | $ 0.13 |
Increase to cash provided by operating activities |  | 2
Decrease to cash provided by financing activities |  | $ 2

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