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Basis of Presentation Basis of Presentation (Details) - USD ($) $ in Millions | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Jun. 01, 2018 | Mar. 01, 2018 | Dec. 31, 2017
Basis of Presentation [Abstract] |  |  |  |  |  |
Document Fiscal Year Focus | 2019 |  |  |  |  |
Cash and Cash Equivalents, at Carrying Value | $ 540 | $ 544 | $ 615 |  |  |
Program cash | 131 | 147 | 115 |  |  |
Restricted Cash and Cash Equivalents | 5 | 10 |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 676 | 701 | 735 |  |  | $ 901
Net Unrealized Gain Or Loss Of Foreign Currency Transactions On Intercompany Loan Hedges | 5 | $ 1 |  |  |  |
Assets Held-for-sale, Not Part of Disposal Group | 24 |  | 25 |  |  |
Equity Method Investments | 0 |  | 0 | $ 19 | $ 20 |
Equity Securities without Readily Determinable Fair Value, Amount | 20 |  | 8 |  |  |
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount | 12 |  |  |  |  |
Other related Revenue | 30 |  |  |  |  |
Adjustments related to New Accounting Pronouncements [Line Items] |  |  |  |  |  |
Operating Lease, Right-of-Use Asset | 2,506 |  | 0 |  |  |
Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |
Adjustments related to New Accounting Pronouncements [Line Items] |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | 5 |  |  |
Property leases [Member] |  |  |  |  |  |
Adjustments related to New Accounting Pronouncements [Line Items] |  |  |  |  |  |
Operating Lease, Right-of-Use Asset | 2,506 |  |  |  |  |
Property leases [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |
Adjustments related to New Accounting Pronouncements [Line Items] |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  | 2,811 |  |  |
Vehicle leases [Member] |  |  |  |  |  |
Adjustments related to New Accounting Pronouncements [Line Items] |  |  |  |  |  |
Operating Lease, Right-of-Use Asset | $ 147 |  |  |  |  |
Vehicle leases [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |
Adjustments related to New Accounting Pronouncements [Line Items] |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  | $ 183 |  |  |

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- Definition The carrying amounts of cash and cash equivalent items related to vehicle programs which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations. + References No definition available. + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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