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Derivatives and Risk Management - Hedge Position (Details) € in Millions, ₩ in Millions, gal in Millions, $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2020 USD ($) gal	Dec. 31, 2019 USD ($) gal	Jun. 30, 2020 EUR (€)	Jun. 30, 2020 KRW (₩)	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 KRW (₩)
Derivatives, Fair Value
Total derivative contracts, net	$ 26	$ 68
Prepaid Expenses and Other
Derivatives, Fair Value
Total derivative contracts, assets	15	38
Other Noncurrent Assets
Derivatives, Fair Value
Total derivative contracts, assets	24	53
Other Accrued Liabilities
Derivatives, Fair Value
Total derivative contracts, liabilities	(13)	(19)
Other Noncurrent Liabilities
Derivatives, Fair Value
Total derivative contracts, liabilities	0	(4)
Foreign exchange contracts - Euro based \| Not designated as hedges
Derivatives, Fair Value
Volume \| €			€ 238		€ 397
Total derivative contracts, net	5	9
Foreign exchange contracts - Euro based \| Not designated as hedges \| Prepaid Expenses and Other
Derivatives, Fair Value
Total derivative contracts, assets	5	9
Foreign exchange contracts - Euro based \| Not designated as hedges \| Other Noncurrent Assets
Derivatives, Fair Value
Total derivative contracts, assets	0	0
Foreign exchange contracts - Euro based \| Not designated as hedges \| Other Accrued Liabilities
Derivatives, Fair Value
Total derivative contracts, liabilities	0	0
Foreign exchange contracts - Euro based \| Not designated as hedges \| Other Noncurrent Liabilities
Derivatives, Fair Value
Total derivative contracts, liabilities	0	0
Foreign exchange contracts - Won based \| Not designated as hedges
Derivatives, Fair Value
Volume \| ₩				₩ 177,045		₩ 177,045
Total derivative contracts, net	1	(3)
Foreign exchange contracts - Won based \| Not designated as hedges \| Prepaid Expenses and Other
Derivatives, Fair Value
Total derivative contracts, assets	0	1
Foreign exchange contracts - Won based \| Not designated as hedges \| Other Noncurrent Assets
Derivatives, Fair Value
Total derivative contracts, assets	1	0
Foreign exchange contracts - Won based \| Not designated as hedges \| Other Accrued Liabilities
Derivatives, Fair Value
Total derivative contracts, liabilities	0	0
Foreign exchange contracts - Won based \| Not designated as hedges \| Other Noncurrent Liabilities
Derivatives, Fair Value
Total derivative contracts, liabilities	$ 0	$ (4)
Fuel hedge contracts \| Not designated as hedges
Derivatives, Fair Value
Volume, nonmonetary \| gal	245	243
Total derivative contracts, net	$ (6)	$ 1
Fuel hedge contracts \| Not designated as hedges \| Prepaid Expenses and Other
Derivatives, Fair Value
Total derivative contracts, assets	7	16
Fuel hedge contracts \| Not designated as hedges \| Other Noncurrent Assets
Derivatives, Fair Value
Total derivative contracts, assets	0	0
Fuel hedge contracts \| Not designated as hedges \| Other Accrued Liabilities
Derivatives, Fair Value
Total derivative contracts, liabilities	(13)	(15)
Fuel hedge contracts \| Not designated as hedges \| Other Noncurrent Liabilities
Derivatives, Fair Value
Total derivative contracts, liabilities	0	0
Fair value hedges \| Interest rate contracts \| Designated as hedges
Derivatives, Fair Value
Volume	150	1,872
Total derivative contracts, net	26	61
Fair value hedges \| Interest rate contracts \| Designated as hedges \| Prepaid Expenses and Other
Derivatives, Fair Value
Total derivative contracts, assets	3	12
Fair value hedges \| Interest rate contracts \| Designated as hedges \| Other Noncurrent Assets
Derivatives, Fair Value
Total derivative contracts, assets	23	53
Fair value hedges \| Interest rate contracts \| Designated as hedges \| Other Accrued Liabilities
Derivatives, Fair Value
Total derivative contracts, liabilities	0	(4)
Fair value hedges \| Interest rate contracts \| Designated as hedges \| Other Noncurrent Liabilities
Derivatives, Fair Value
Total derivative contracts, liabilities	$ 0	$ 0