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Debt - Summary of Total Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Debt $ 26,053 $ 24,854
Total Bonds    
Debt Instrument [Line Items]    
Debt 9,582 7,710
Asset-backed debt    
Debt Instrument [Line Items]    
Debt 11,922 11,757
Other debt    
Debt Instrument [Line Items]    
Debt 4,549 5,387
Intersegment debt    
Debt Instrument [Line Items]    
Debt 0 0
Industrial Activities    
Debt Instrument [Line Items]    
Debt 8,288 6,558
Industrial Activities | Total Bonds    
Debt Instrument [Line Items]    
Debt 6,366 5,061
Industrial Activities | Asset-backed debt    
Debt Instrument [Line Items]    
Debt 0 0
Industrial Activities | Other debt    
Debt Instrument [Line Items]    
Debt 905 165
Industrial Activities | Intersegment debt    
Debt Instrument [Line Items]    
Debt 1,017 1,332
Financial Services    
Debt Instrument [Line Items]    
Debt 19,638 20,748
Financial Services | Total Bonds    
Debt Instrument [Line Items]    
Debt 3,216 2,649
Financial Services | Asset-backed debt    
Debt Instrument [Line Items]    
Debt 11,922 11,757
Financial Services | Other debt    
Debt Instrument [Line Items]    
Debt 3,644 5,222
Financial Services | Intersegment debt    
Debt Instrument [Line Items]    
Debt $ 856 $ 1,120