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v3.20.4

Other assets - Favorable contracts (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Jul. 01, 2018 | Dec. 31, 2020 | Dec. 31, 2019
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Impairment of favorable contracts |  |  | $ (21) | $ 0
Amortization of favorable contracts | $ (58) | $ 0 | (1) | (134)
Net carrying amount, end of period |  |  | 10 |
Favorable contracts |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Gross carrying amount, beginning of period |  |  | 287 | 287
Accumulated amortization, end of period | (101) |  | (256) | (254)
Net carrying amount, beginning of period |  |  | 33 | 186
Amortization of favorable contracts |  |  | (2) | (153)
Gross carrying amount, end of period | 287 |  | 266 | 287
Accumulated amortization, beginning of period |  |  | (254) | (101)
Net carrying amount, end of period | $ 186 |  | $ 10 | $ 33

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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