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Fair Value Measurements (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 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 $ (40)   $ (52)  
Assets, fair value disclosure 3,927   3,114  
Derivative liability, fair value, gross asset and right to reclaim cash, offset 96   111  
Derivative liabilities (99)   (111)  
Cash collateral, net receivable, offset against derivative positions 56   59  
Recurring [Member] | Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value disclosure 3,196   2,423  
Derivative liabilities (1)   (1)  
Recurring [Member] | Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value disclosure 652   625  
Derivative liabilities (179)   (212)  
Recurring [Member] | Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value disclosure 119   118  
Derivative liabilities (15)   (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 506   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  
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 506   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  
Money market mutual funds [Member] | Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity Securities, FV-NI 1,169   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 1,169   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  
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  
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 190   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 190   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  
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  
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  
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  
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  
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  
Corporate obligations [Member] | Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt Securities, Available-for-sale 47   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  
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 47   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  
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  
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  
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  
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  
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  
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  
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  
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  
United States companies [Member] | Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity Securities, FV-NI 292   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 292   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  
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  
International companies [Member] | Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity Securities, FV-NI 1,363   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 1,363   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  
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  
Investment funds [Member] | Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity Securities, FV-NI 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   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  
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  
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 (40)   (52)  
Derivative assets 142   148  
Derivative liability, fair value, gross asset and right to reclaim cash, offset 96   111  
Derivative liabilities (80)   (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   1  
Derivative liability, fair value, gross liability including not subject to master netting arrangement 0   (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 82   91  
Derivative liability, fair value, gross liability including not subject to master netting arrangement (162)   (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 100   108  
Derivative liability, fair value, gross liability including not subject to master netting arrangement (14)   (9)  
Interest Rate Contract [Member] | Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative assets 29   24  
Derivative liabilities (19)   (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   1  
Derivative liability, fair value, gross liability including not subject to master netting arrangement (1)   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 10   13  
Derivative liability, fair value, gross liability including not subject to master netting arrangement (17)   (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 19   10  
Derivative liability, fair value, gross liability including not subject to master netting arrangement (1)   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 $ 81 99 $ 94
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings 3 0    
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net 11 9    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 1 1    
Fair Value, Measurements With Unobservable Inputs Reconciliation, Recurring Basis, Assets and Liability, Net, Settlements 0 4    
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 18 16 $ 10 $ 9
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings (53) (30)    
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0    
Fair Value, Measurements With Unobservable Inputs Reconciliation, Recurring Basis, Assets and Liability, Net, Settlements $ 45 $ 23