| Debt - Interest Expense (Details) - USD ($) $ in Millions | 3 Months Ended | |
|---|---|---|
| Mar. 31, 2021 | Mar. 31, 2020 | |
| Debt Disclosure [Abstract] | ||
| Total interest cost | $ 247 | $ 254 | 
| Capitalized interest | (30) | (20) | 
| Total interest expense, net of capitalized interest | $ 217 | $ 234 | 
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- References No definition available. 
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- Definition Amount of interest costs capitalized disclosed as an adjusting item to interest costs incurred. No definition available. 
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- Definition Total interest costs incurred during the period and either capitalized or charged against earnings. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Amount of the cost of borrowed funds accounted for as interest expense. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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