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Significant Accounting Policies - Contract Balances (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Accounting Policies [Abstract] |  |  |  |
Trade receivables (included in accounts receivable, net) |  |  | $ 6,717 | $ 6,497
Contract liabilities (included in accrued expenses) | $ 67 | $ 53 | $ 73 | $ 67
Change in Contract with Customer, Liability [Abstract] |  |  |  |
Balance at December 31, 2018 | 67 | 53 |  |
Adoption of ASU 2014-09 | 0 | 17 |  |
Rewards earnings and gift card issuances | 365 | 332 |  |
Redemption and breakage | (359) | (335) |  |
Balance at December 31, 2019 | $ 73 | $ 67 |  |

X
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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130533-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 + Details
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