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Commitments and Contingencies Fiscal Year Maturity Schedule (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Loans and Mortgage-Related Securities [Abstract]  
2018 $ 73,130
2019 0
2020 0
2021 0
2022 0
Thereafter 0
Total 73,130
Operating Leases [Abstract]  
2018 41
2019 48
2020 56
2021 56
2022 58
Thereafter 609
Total 868
Other [Abstract]  
2018 98
2019 57
2020 73
2021 14
2022 1
Thereafter 0
Total 243
Mortgage commitment derivatives  
Loans and Mortgage-Related Securities [Abstract]  
Total $ 72,700