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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, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Properties, plant and equipment, net (held and used) $ 102 $ 603
Properties, plant and equipment, net (held for sale) 1,694 1,378
Investments and advances 81 28
Total assets at fair value 1,877 2,009
Properties, plant and equipment, net (held and used), Before-Tax Loss 97 658
Properties, plant and equipment, net (held for sale), Before-Tax Loss 638 363
Investments and advances, Before-Tax Loss 69 26
Total nonrecurring assets at fair value, Before-Tax Loss 804 1,047
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) 62 0
Properties, plant and equipment, net (held for sale) 1,273 1,378
Investments and advances 20 1
Total assets at fair value 1,355 1,379
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Properties, plant and equipment, net (held and used) 40 603
Properties, plant and equipment, net (held for sale) 421 0
Investments and advances 61 27
Total assets at fair value $ 522 $ 630