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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, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Properties, plant and equipment, net (held and used) $ 2,177 $ 102
Properties, plant and equipment, net (held for sale) 1,412 1,694
Investments and advances 52 81
Total assets at fair value 3,641 1,877
Properties, plant and equipment, net (held and used), Before-Tax Loss 2,095 97
Properties, plant and equipment, net (held for sale), Before-Tax Loss 8,702 638
Investments and advances, Before-Tax Loss 594 69
Total nonrecurring assets at fair value, Before-Tax Loss 11,391 804
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) 0 62
Properties, plant and equipment, net (held for sale) 1,412 1,273
Investments and advances 30 20
Total assets at fair value 1,442 1,355
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Properties, plant and equipment, net (held and used) 2,177 40
Properties, plant and equipment, net (held for sale) 0 421
Investments and advances 22 61
Total assets at fair value $ 2,199 $ 522