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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

X

- 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.

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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