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Fair Value Measurements - Summary of Assets and Liabilities Measured On a Non-Recurring Basis (Details) - Nonrecurring basis - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Properties, plant and equipment, net (held and used) $ 2,443 $ 2,177
Properties, plant and equipment, net (held for sale) 1,418 1,412
Investments and advances 28 52
Total assets at fair value 3,889 3,641
Properties, plant and equipment, net (held and used), Before-Tax Loss 2,599 2,095
Properties, plant and equipment, net (held for sale), Before-Tax Loss 193 8,702
Investments and advances, Before-Tax Loss 2,555 594
Total nonrecurring assets at fair value, Before-Tax Loss 5,347 11,391
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Properties, plant and equipment, net (held and used) 0 0
Properties, plant and equipment, net (held for sale) 0 0
Investments and advances 0 0
Total assets at fair value 0 0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Properties, plant and equipment, net (held and used) 20 0
Properties, plant and equipment, net (held for sale) 1,418 1,412
Investments and advances 0 30
Total assets at fair value 1,438 1,442
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Properties, plant and equipment, net (held and used) 2,423 2,177
Properties, plant and equipment, net (held for sale) 0 0
Investments and advances 28 22
Total assets at fair value $ 2,451 $ 2,199