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Fair Value Measurements (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability, statement of financial position, extensible enumeration, not disclosed flag Liabilities: Liabilities:
Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, offset $ (194) $ (47)
Assets, fair value 8,824 10,843
Derivative liability, offset 107 73
Liabilities, fair value (242) (277)
Cash collateral receivable (payable), offset against derivative positions (87) 26
Recurring | Mortgage loans held for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage loans held for sale 474 1,263
Recurring | Money market mutual funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment funds 1,178 554
Recurring | U.S. government obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities 2,146 232
Recurring | International government obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities 1 2
Recurring | Corporate obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities 70 90
Recurring | Municipal obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities 3 3
Recurring | Agency, asset and mortgage-backed obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities 1 2
Recurring | U.S. companies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment funds 360 428
Recurring | International companies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment funds 3,771 7,703
Recurring | Investment funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment funds 231 237
Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value 7,742 9,160
Liabilities, fair value (8) (2)
Recurring | Level 1 | Mortgage loans held for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage loans held for sale 0 0
Recurring | Level 1 | Money market mutual funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment funds 1,178 554
Recurring | Level 1 | U.S. government obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities 2,146 232
Recurring | Level 1 | International government obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities 0 0
Recurring | Level 1 | Corporate obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities 0 0
Recurring | Level 1 | Municipal obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities 0 0
Recurring | Level 1 | Agency, asset and mortgage-backed obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities 0 0
Recurring | Level 1 | U.S. companies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment funds 360 428
Recurring | Level 1 | International companies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment funds 3,771 7,703
Recurring | Level 1 | Investment funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment funds 231 237
Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value 1,217 1,637
Liabilities, fair value (229) (123)
Recurring | Level 2 | Mortgage loans held for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage loans held for sale 474 1,263
Recurring | Level 2 | Money market mutual funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment funds 0 0
Recurring | Level 2 | U.S. government obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities 0 0
Recurring | Level 2 | International government obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities 1 2
Recurring | Level 2 | Corporate obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities 70 90
Recurring | Level 2 | Municipal obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities 3 3
Recurring | Level 2 | Agency, asset and mortgage-backed obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities 1 2
Recurring | Level 2 | U.S. companies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment funds 0 0
Recurring | Level 2 | International companies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment funds 0 0
Recurring | Level 2 | Investment funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment funds 0 0
Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value 59 93
Liabilities, fair value (112) (225)
Recurring | Level 3 | Mortgage loans held for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage loans held for sale 0 0
Recurring | Level 3 | Money market mutual funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment funds 0 0
Recurring | Level 3 | U.S. government obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities 0 0
Recurring | Level 3 | International government obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities 0 0
Recurring | Level 3 | Corporate obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities 0 0
Recurring | Level 3 | Municipal obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities 0 0
Recurring | Level 3 | Agency, asset and mortgage-backed obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities 0 0
Recurring | Level 3 | U.S. companies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment funds 0 0
Recurring | Level 3 | International companies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment funds 0 0
Recurring | Level 3 | Investment funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment funds 0 0
Commodity derivatives | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, offset (194) (47)
Derivative assets 477 302
Derivative liability, offset 106 73
Derivative liability (218) (266)
Commodity derivatives | Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, not subject to master netting arrangement 6 5
Derivative liability, not subject to master netting arrangement (8) (2)
Commodity derivatives | Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, not subject to master netting arrangement 614 271
Derivative liability, not subject to master netting arrangement (206) (113)
Commodity derivatives | Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, not subject to master netting arrangement 51 73
Derivative liability, not subject to master netting arrangement (110) (224)
Foreign currency exchange rate derivatives | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets   3
Derivative liability (21) (3)
Foreign currency exchange rate derivatives | Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, not subject to master netting arrangement   0
Derivative liability, not subject to master netting arrangement 0 0
Foreign currency exchange rate derivatives | Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, not subject to master netting arrangement   3
Derivative liability, not subject to master netting arrangement (21) (3)
Foreign currency exchange rate derivatives | Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, not subject to master netting arrangement   0
Derivative liability, not subject to master netting arrangement 0 0
Interest rate derivatives | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 112 24
Derivative liability, offset 1  
Derivative liability (3) (8)
Interest rate derivatives | Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, not subject to master netting arrangement 50 1
Derivative liability, not subject to master netting arrangement 0 0
Interest rate derivatives | Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, not subject to master netting arrangement 54 3
Derivative liability, not subject to master netting arrangement (2) (7)
Interest rate derivatives | Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, not subject to master netting arrangement 8 20
Derivative liability, not subject to master netting arrangement $ (2) $ (1)