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Loans and Allowance for Credit Losses - Amortized Cost Basis (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 $ 3,935  
2019 2,313  
2018 1,918  
2017 1,272  
2016 495  
Prior 95  
Revolving Loans 17,897  
Loans, gross 27,925 $ 26,309
Interest income 72  
Investment grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans, gross 22,583 21,267
Speculative    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans, gross 5,224 5,008
Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans, gross 67 25
Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans, gross 34 9
Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans, gross 17 26,309
Geographic Distribution, Domestic    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans, gross 21,132 20,528
Non-U.S.    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans, gross 6,793 5,781
Commercial and Financial Segment    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans, gross 25,829  
Commercial and Financial Segment | Investment grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans, gross 20,859 19,501
Commercial and Financial Segment | Speculative    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans, gross 4,852 5,008
Commercial and Financial Segment | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans, gross 67 25
Commercial and Financial Segment | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans, gross 34 9
Commercial and Financial Segment | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans, gross 17 24,543
Commercial and Financial Segment | Geographic Distribution, Domestic    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 2,326  
2019 1,363  
2018 826  
2017 816  
2016 272  
Prior 0  
Revolving Loans 13,433  
Loans, gross 19,036  
Commercial and Financial Segment | Geographic Distribution, Domestic | Investment grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1,894  
2019 388  
2018 4  
2017 167  
2016 200  
Prior 0  
Revolving Loans 12,836  
Loans, gross 15,489  
Commercial and Financial Segment | Geographic Distribution, Domestic | Speculative    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 432  
2019 942  
2018 822  
2017 610  
2016 43  
Prior 0  
Revolving Loans 597  
Loans, gross 3,446  
Commercial and Financial Segment | Geographic Distribution, Domestic | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 28  
2018 0  
2017 39  
2016 0  
Prior 0  
Revolving Loans 0  
Loans, gross 67  
Commercial and Financial Segment | Geographic Distribution, Domestic | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 5  
2018 0  
2017 0  
2016 29  
Prior 0  
Revolving Loans 0  
Loans, gross 34  
Commercial and Financial Segment | Geographic Distribution, Domestic | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans 0  
Loans, gross 0  
Commercial and Financial Segment | Non-U.S.    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1,311  
2019 401  
2018 346  
2017 179  
2016 26  
Prior 66  
Revolving Loans 4,464  
Loans, gross 6,793  
Commercial and Financial Segment | Non-U.S. | Investment grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1,028  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans 4,343  
Loans, gross 5,371  
Commercial and Financial Segment | Non-U.S. | Speculative    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 283  
2019 401  
2018 346  
2017 162  
2016 26  
Prior 66  
Revolving Loans 121  
Loans, gross 1,405  
Commercial and Financial Segment | Non-U.S. | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 17  
2016 0  
Prior 0  
Revolving Loans 0  
Loans, gross 17  
Commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans, gross 2,096  
Commercial real estate | Investment grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans, gross 1,724 1,766
Commercial real estate | Speculative    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans, gross 372 0
Commercial real estate | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans, gross 0 0
Commercial real estate | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans, gross 0 0
Commercial real estate | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans, gross 0 1,766
Commercial real estate | Geographic Distribution, Domestic    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 298  
2019 549  
2018 746  
2017 277  
2016 197  
Prior 29  
Revolving Loans 0  
Loans, gross 2,096 $ 1,766
Commercial real estate | Geographic Distribution, Domestic | Investment grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 178  
2019 383  
2018 688  
2017 277  
2016 197  
Prior 0  
Revolving Loans 0  
Loans, gross 1,723  
Commercial real estate | Geographic Distribution, Domestic | Speculative    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 120  
2019 166  
2018 58  
2017 0  
2016 0  
Prior 29  
Revolving Loans 0  
Loans, gross $ 373