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Accounting Policies - Contract Balances and Activity (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Accounting Policies |  |  |
Receivables (included in accounts receivable, net) |  | $ 6,611 | $ 7,873
Contract liabilities (included in accrued expenses) | $ 53 | $ 72 | $ 53
Rollforward of contract liabilities |  |  |
Balance at beginning of period | 53 |  |
Adoption of ASU 2014-09 | 17 |  |
Loyalty program earnings and gift card issuance | 166 |  |
Redemption and breakage | (164) |  |
Balance at end of period | $ 72 |  |

X
- Definition Amount of increase (decrease) in contract liability recognized for loyalty program earnings and gift card issuance. + References No definition available. + Details
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- Definition Amount of increase (decrease) in contract liability recognized for redemption and breakage. + References No definition available. + Details
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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130533-203044 + Details
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- Definition Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from change in measure of progress which (increases) decreases obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130551-203045 + Details
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