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Integration and Restructuring Costs (Restructuring Activities) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Restructuring Reserve [Roll Forward] |  |  |
Liability at beginning of period | $ 65 | $ 93 | $ 93
Expense Incurred | 161 | 40 | 44
Cash Paid | (114) | (71) | (44)
Other | 0 | 3 |
Liability at end of period | 112 | 65 | 93
Severance |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Liability at beginning of period | 15 | 32 |
Expense Incurred | 137 | 31 |
Cash Paid | (77) | (49) |
Other | (2) | 1 |
Liability at end of period | 73 | 15 | 32
Future rent under non-cancelable leases and other costs |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Liability at beginning of period | 50 | 61 |
Expense Incurred | 24 | 9 |
Cash Paid | (37) | (22) |
Other | 2 | 2 |
Liability at end of period | $ 39 | $ 50 | $ 61

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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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