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Leases, Remaining Minimum Lease Payments (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Operating Leases |  |  |
2019 | [1] | $ 273 |
2020 |  | 267 |
2021 |  | 191 |
2022 |  | 157 |
2023 |  | 131 |
Thereafter |  | 576 |
Total undiscounted lease payments |  | 1,595 |
Less amount associated with discounting |  | 335 |
Total lease liabilities |  | 1,260 |
Finance Leases |  |  |
2019 | [1] | 51 |
2020 |  | 65 |
2021 |  | 63 |
2022 |  | 64 |
2023 |  | 65 |
Thereafter |  | 939 |
Total undiscounted lease payments |  | 1,247 |
Less amount associated with discounting |  | 641 |
Total lease liabilities |  | $ 606 |
Operating Leases |  |  |
2019 |  |  | $ 359
2020 |  |  | 245
2021 |  |  | 178
2022 |  |  | 146
2023 |  |  | 123
Thereafter |  |  | 514
Total undiscounted lease payments |  |  | 1,565
Capital Leases |  |  |
2019 |  |  | 69
2020 |  |  | 65
2021 |  |  | 62
2022 |  |  | 64
2023 |  |  | 65
Thereafter |  |  | 957
Total undiscounted lease payments |  |  | 1,282
Less amount associated with discounting |  |  | 676
Total lease liabilities |  |  | $ 606
[1] | The amounts as of March 31, 2019 are for the remaining nine months of 2019.

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 + Details
Name: | us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant