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Summary of Significant Accounting Policies - Goodwill (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Accounting Policies [Abstract] |  |  |
Goodwill impairment | $ 0 |  |
Accumulated impairment loss | 0 | $ 0 |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning balance |  | 5,590,000,000 | $ 5,373,000,000
Acquired goodwill |  | 247,000,000 | 217,000,000
Disposed goodwill |  | (131,000,000) | (3,000,000)
Foreign currency adjustments |  | (4,000,000) | 3,000,000
Goodwill, ending balance | 5,702,000,000 | 5,702,000,000 | 5,590,000,000
Payments |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning balance |  | 3,757,000,000 | 3,610,000,000
Acquired goodwill |  | 240,000,000 | 146,000,000
Disposed goodwill |  | 0 | 0
Foreign currency adjustments |  | (1,000,000) | 1,000,000
Goodwill, ending balance | 3,996,000,000 | 3,996,000,000 | 3,757,000,000
Financial |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning balance |  | 1,833,000,000 | 1,763,000,000
Acquired goodwill |  | 7,000,000 | 71,000,000
Disposed goodwill |  | (131,000,000) | (3,000,000)
Foreign currency adjustments |  | (3,000,000) | 2,000,000
Goodwill, ending balance | $ 1,706,000,000 | $ 1,706,000,000 | $ 1,833,000,000

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