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Fair Value Measurements (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Recurring [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset $ (25)   $ (25)     $ (52)    
Assets, fair value disclosure 4,266   4,266     3,114    
Derivative liability, fair value, gross asset and right to reclaim cash, offset 117   117     111    
Derivative liabilities (120)   (120)     (111)    
Cash collateral, net receivable, offset against derivative positions 92   92     59    
Recurring [Member] | Level 1 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Assets, fair value disclosure 2,995   2,995     2,423    
Derivative liabilities (4)   (4)     (1)    
Recurring [Member] | Level 2 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Assets, fair value disclosure 1,165   1,165     625    
Derivative liabilities (211)   (211)     (212)    
Recurring [Member] | Level 3 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Assets, fair value disclosure 131   131     118    
Derivative liabilities (22)   (22)     (9)    
Mortgage Loans on Real Estate [Member] | Recurring [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Mortgages Held-for-sale, Fair Value Disclosure 1,065   1,065     468    
Mortgage Loans on Real Estate [Member] | Recurring [Member] | Level 1 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Mortgages Held-for-sale, Fair Value Disclosure 0   0     0    
Mortgage Loans on Real Estate [Member] | Recurring [Member] | Level 2 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Mortgages Held-for-sale, Fair Value Disclosure 1,065   1,065     468    
Mortgage Loans on Real Estate [Member] | Recurring [Member] | Level 3 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Mortgages Held-for-sale, Fair Value Disclosure 0   0     0    
Money market mutual funds [Member] | Recurring [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Equity Securities, FV-NI 951   951     409    
Money market mutual funds [Member] | Recurring [Member] | Level 1 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Equity Securities, FV-NI 951   951     409    
Money market mutual funds [Member] | Recurring [Member] | Level 2 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Equity Securities, FV-NI 0   0     0    
Money market mutual funds [Member] | Recurring [Member] | Level 3 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Equity Securities, FV-NI 0   0     0    
United States government obligations [Member] | Recurring [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Debt Securities, Available-for-sale 193   193     187    
United States government obligations [Member] | Recurring [Member] | Level 1 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Debt Securities, Available-for-sale 193   193     187    
United States government obligations [Member] | Recurring [Member] | Level 2 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Debt Securities, Available-for-sale 0   0     0    
United States government obligations [Member] | Recurring [Member] | Level 3 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Debt Securities, Available-for-sale 0   0     0    
International government obligations [Member] | Recurring [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Debt Securities, Available-for-sale 4   4     4    
International government obligations [Member] | Recurring [Member] | Level 1 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Debt Securities, Available-for-sale 0   0     0    
International government obligations [Member] | Recurring [Member] | Level 2 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Debt Securities, Available-for-sale 4   4     4    
International government obligations [Member] | Recurring [Member] | Level 3 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Debt Securities, Available-for-sale 0   0     0    
Corporate obligations [Member] | Recurring [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Debt Securities, Available-for-sale 49   49     46    
Corporate obligations [Member] | Recurring [Member] | Level 1 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Debt Securities, Available-for-sale 0   0     0    
Corporate obligations [Member] | Recurring [Member] | Level 2 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Debt Securities, Available-for-sale 49   49     46    
Corporate obligations [Member] | Recurring [Member] | Level 3 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Debt Securities, Available-for-sale 0   0     0    
Municipal obligations [Member] | Recurring [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Debt Securities, Available-for-sale 2   2     2    
Municipal obligations [Member] | Recurring [Member] | Level 1 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Debt Securities, Available-for-sale 0   0     0    
Municipal obligations [Member] | Recurring [Member] | Level 2 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Debt Securities, Available-for-sale 2   2     2    
Municipal obligations [Member] | Recurring [Member] | Level 3 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Debt Securities, Available-for-sale 0   0     0    
US Government-sponsored Enterprises Debt Securities [Member] | Recurring [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Debt Securities, Available-for-sale 1   1     1    
US Government-sponsored Enterprises Debt Securities [Member] | Recurring [Member] | Level 1 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Debt Securities, Available-for-sale 0   0     0    
US Government-sponsored Enterprises Debt Securities [Member] | Recurring [Member] | Level 2 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Debt Securities, Available-for-sale 1   1     1    
US Government-sponsored Enterprises Debt Securities [Member] | Recurring [Member] | Level 3 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Debt Securities, Available-for-sale 0   0     0    
United States companies [Member] | Recurring [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Equity Securities, FV-NI 311   311     256    
United States companies [Member] | Recurring [Member] | Level 1 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Equity Securities, FV-NI 311   311     256    
United States companies [Member] | Recurring [Member] | Level 2 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Equity Securities, FV-NI 0   0     0    
United States companies [Member] | Recurring [Member] | Level 3 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Equity Securities, FV-NI 0   0     0    
International companies [Member] | Recurring [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Equity Securities, FV-NI 1,358   1,358     1,441    
International companies [Member] | Recurring [Member] | Level 1 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Equity Securities, FV-NI 1,358   1,358     1,441    
International companies [Member] | Recurring [Member] | Level 2 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Equity Securities, FV-NI 0   0     0    
International companies [Member] | Recurring [Member] | Level 3 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Equity Securities, FV-NI 0   0     0    
Investment funds [Member] | Recurring [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Equity Securities, FV-NI 182   182     128    
Investment funds [Member] | Recurring [Member] | Level 1 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Equity Securities, FV-NI 182   182     128    
Investment funds [Member] | Recurring [Member] | Level 2 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Equity Securities, FV-NI 0   0     0    
Investment funds [Member] | Recurring [Member] | Level 3 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Equity Securities, FV-NI 0   0     0    
Commodity derivative [Member] | Recurring [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset (25)   (25)     (52)    
Derivative assets 119   119     148    
Derivative liability, fair value, gross asset and right to reclaim cash, offset 117   117     111    
Derivative liabilities (92)   (92)     (79)    
Commodity derivative [Member] | Recurring [Member] | Level 1 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Derivative asset, fair value, gross asset including not subject to master netting arrangement 0   0     1    
Derivative liability, fair value, gross liability including not subject to master netting arrangement (2)   (2)     (1)    
Commodity derivative [Member] | Recurring [Member] | Level 2 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Derivative asset, fair value, gross asset including not subject to master netting arrangement 38   38     91    
Derivative liability, fair value, gross liability including not subject to master netting arrangement (187)   (187)     (180)    
Commodity derivative [Member] | Recurring [Member] | Level 3 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Derivative asset, fair value, gross asset including not subject to master netting arrangement 106   106     108    
Derivative liability, fair value, gross liability including not subject to master netting arrangement (20)   (20)     (9)    
Interest Rate Contract [Member] | Recurring [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Derivative assets 31   31     24    
Derivative liabilities (28)   (28)     (32)    
Interest Rate Contract [Member] | Recurring [Member] | Level 1 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Derivative asset, fair value, gross asset including not subject to master netting arrangement 0   0     1    
Derivative liability, fair value, gross liability including not subject to master netting arrangement (2)   (2)     0    
Interest Rate Contract [Member] | Recurring [Member] | Level 2 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Derivative asset, fair value, gross asset including not subject to master netting arrangement 6   6     13    
Derivative liability, fair value, gross liability including not subject to master netting arrangement (24)   (24)     (32)    
Interest Rate Contract [Member] | Recurring [Member] | Level 3 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Derivative asset, fair value, gross asset including not subject to master netting arrangement 25   25     10    
Derivative liability, fair value, gross liability including not subject to master netting arrangement (2)   (2)     0    
Commodity derivative [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset (Liability), Net, Value 86 $ 83 86 $ 83 $ 86 99 $ 81 $ 94
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings (8) (4) (5) (4)        
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net 12 5 23 14        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 3 0 4 1        
Fair Value, Measurements With Unobservable Inputs Reconciliation, Recurring Basis, Assets and Liability, Net, Settlements (2) (2) (2) 2        
Interest Rate Lock Commitments [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset (Liability), Net, Value 23 17 23 17 $ 18 $ 10 $ 16 $ 9
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings (94) (56) (147) (86)        
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0 0 0        
Fair Value, Measurements With Unobservable Inputs Reconciliation, Recurring Basis, Assets and Liability, Net, Settlements $ 89 $ 55 $ 134 $ 78