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Employee Benefit Plans Level 4 Defined Benefit Plan, Information about Plan Assets (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Projected Benefit Obligation $ 5,734,000,000 $ 6,025,000,000  
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Accumulated Benefit Obligation 5,732,000,000 6,024,000,000  
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Fair Value of Plan Assets 4,430,000,000 4,707,000,000  
Fair Value, Inputs, Level 2 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Defined Benefit Plan, Transfers Between Measurement Levels   (238,000,000)  
Fair Value, Inputs, Level 3 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   257,000,000 $ 391,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   4,000,000  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)   7,000,000  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   242,000,000  
Defined Benefit Plan Issuance (17,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   (193,000,000)  
Defined Benefit Plan, Transfers Between Measurement Levels   44,000,000  
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Defined Benefit Plan, Transfers Between Measurement Levels   (5,000,000)  
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   34,000,000 12,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)   0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   12,000,000  
Defined Benefit Plan Issuance 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   (5,000,000)  
Defined Benefit Plan, Transfers Between Measurement Levels   20,000,000  
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   28,000,000 2,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)   7,000,000  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   3,000,000  
Defined Benefit Plan Issuance (14,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   (1,000,000)  
Defined Benefit Plan, Transfers Between Measurement Levels   17,000,000  
Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   5,000,000 4,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)   1,000,000  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   2,000,000  
Defined Benefit Plan Issuance 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   (2,000,000)  
Mortgage Loans on Real Estate, Loan Category [Domain] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Defined Benefit Plan Issuance 0    
Other Fixed Income [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Defined Benefit Plan, Transfers Between Measurement Levels   (9,000,000)  
Other Fixed Income [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   9,000,000 12,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)   (5,000,000)  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   6,000,000  
Defined Benefit Plan Issuance (3,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   (2,000,000)  
Defined Benefit Plan, Transfers Between Measurement Levels   7,000,000  
Hedge Funds [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Defined Benefit Plan, Transfers Between Measurement Levels   (224,000,000)  
Hedge Funds [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   181,000,000 361,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   4,000,000  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)   4,000,000  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   219,000,000  
Defined Benefit Plan Issuance 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   (183,000,000)  
Private Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Defined Benefit Plan Issuance 0    
Other Pension Plan [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Defined Benefit Plan, Transfers Between Measurement Levels (1,000,000)    
Other Pension Plan [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 2,000,000 3,000,000 0
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Realized Gain (Loss)   0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 1,000,000 3,000,000  
Defined Benefit Plan Issuance 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales (1,000,000) 0  
Other Pension Plan [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 3,000,000 3,000,000 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 1,000,000 3,000,000  
Defined Benefit Plan Issuance (1,000,000)    
Other Pension Plan [Member] | Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 0 0 0
Defined Benefit Plan Issuance 0    
Other Pension Plan [Member] | Other Fixed Income [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 0 0 0
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Realized Gain (Loss)   0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0  
Defined Benefit Plan Issuance 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 0  
Other Pension Plan [Member] | Hedge Funds [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Defined Benefit Plan, Transfers Between Measurement Levels (1,000,000)    
Other Pension Plan [Member] | Hedge Funds [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 5,000,000 6,000,000 0
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Realized Gain (Loss)   0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 2,000,000 6,000,000  
Defined Benefit Plan Issuance (1,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales (1,000,000) 0  
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) $ 0 $ 0 0
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Defined Benefit Plan Weighted Average Allocation Percentage of Asset Equity Securities 20.00% 21.00%  
Defined Benefit Plan Weighted Average Allocation Percentage of Asset Debt Securities 66.00% 62.00%  
Defined Benefit Plan Weighted Average Allocation Percentage of Asset Other 14.00% 17.00%  
Defined Benefit Plan Weighted Average Allocation Percentage of Assets 100.00% 100.00%  
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value $ 4,470,000,000 [1] $ (4,727,000,000) [2]  
Investment Payables Net of Investment Receivables 0 0  
Interest Receivables 0 0  
Defined Benefit Plan, Settlements, Benefit Obligation $ 0 319,000,000  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Support, Methodology and Source Data 567    
Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value $ 821,000,000 [1] (1,041,000,000) [2]  
Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Defined Benefit Plan, Transfers Between Measurement Levels (128,000,000)    
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value 3,468,000,000 [1] (3,429,000,000) [2]  
Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 181,000,000 257,000,000  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (1,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 103,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales (38,000,000)    
Defined Benefit Plan, Transfers Between Measurement Levels 5,000,000    
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value 181,000,000 [1] (257,000,000) [2]  
Pension Plan [Member] | Short-term Investments [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (281,000,000) (308,000,000)  
Pension Plan [Member] | Short-term Investments [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (7,000,000) (56,000,000)  
Pension Plan [Member] | Short-term Investments [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (274,000,000) (252,000,000)  
Pension Plan [Member] | Short-term Investments [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value $ 0 0  
Pension Plan [Member] | Equity Securities [Member]      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum 5.00%    
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum 20.00%    
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value $ (385,000,000) (438,000,000)  
Pension Plan [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (298,000,000) (435,000,000)  
Pension Plan [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (87,000,000) (3,000,000)  
Pension Plan [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value $ 0 0  
Pension Plan [Member] | Fixed Income Funds [Member]      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum 50.00%    
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum 70.00%    
Pension Plan [Member] | Alternative Assets [Member]      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum 10.00%    
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum 45.00%    
Pension Plan [Member] | Corporate Debt Securities [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value $ (941,000,000) (953,000,000)  
Pension Plan [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value 0 0  
Pension Plan [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Defined Benefit Plan, Transfers Between Measurement Levels (14,000,000)    
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (922,000,000) (919,000,000)  
Pension Plan [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 19,000,000 34,000,000  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (2,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 12,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales (11,000,000)    
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (19,000,000) (34,000,000)  
Pension Plan [Member] | Residential Mortgage Backed Securities [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (266,000,000) (209,000,000)  
Pension Plan [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value 0 0  
Pension Plan [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Defined Benefit Plan, Transfers Between Measurement Levels (6,000,000)    
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (242,000,000) (181,000,000)  
Pension Plan [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 24,000,000 28,000,000  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 14,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales (2,000,000)    
Defined Benefit Plan, Transfers Between Measurement Levels 4,000,000    
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (24,000,000) (28,000,000)  
Pension Plan [Member] | US Treasury Securities [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (1,048,000,000) (1,227,000,000)  
Pension Plan [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (16,000,000) (24,000,000)  
Pension Plan [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (1,029,000,000) (1,198,000,000)  
Pension Plan [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (3,000,000) (5,000,000)  
Pension Plan [Member] | Foreign Government Debt Securities [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (54,000,000) (70,000,000)  
Pension Plan [Member] | Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value 0 0  
Pension Plan [Member] | Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (49,000,000) (65,000,000)  
Pension Plan [Member] | Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 5,000,000 5,000,000  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (1,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 1,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0    
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (5,000,000) (5,000,000)  
Pension Plan [Member] | Mortgage Loans on Real Estate, Loan Category [Domain] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 54,000,000 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 54,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0    
Pension Plan [Member] | Commercial Mortgage Backed Securities [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (183,000,000) (156,000,000)  
Pension Plan [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value 0 0  
Pension Plan [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (183,000,000) (156,000,000)  
Pension Plan [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value 0 0  
Pension Plan [Member] | Other Fixed Income [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (106,000,000) [3] (97,000,000) [4]  
Pension Plan [Member] | Other Fixed Income [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value 0 [3] 0 [4]  
Pension Plan [Member] | Other Fixed Income [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Defined Benefit Plan, Transfers Between Measurement Levels (3,000,000)    
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (105,000,000) [3] (93,000,000) [4]  
Pension Plan [Member] | Other Fixed Income [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 5,000,000 9,000,000  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (1,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 3,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales (1,000,000)    
Defined Benefit Plan, Transfers Between Measurement Levels 1,000,000    
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (1,000,000) [3] (4,000,000) [4]  
Pension Plan [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (54,000,000)    
Pension Plan [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value 0    
Pension Plan [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value 0    
Pension Plan [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (54,000,000)    
Pension Plan [Member] | Hedge Funds [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value 620,000,000 (743,000,000)  
Pension Plan [Member] | Hedge Funds [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value 0 0  
Pension Plan [Member] | Hedge Funds [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Defined Benefit Plan, Transfers Between Measurement Levels (105,000,000)    
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value 566,000,000 (562,000,000)  
Pension Plan [Member] | Hedge Funds [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 54,000,000 181,000,000  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 2,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales (24,000,000)    
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value 54,000,000 (181,000,000)  
Pension Plan [Member] | Private Equity Funds [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value 20,000,000    
Pension Plan [Member] | Private Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value 0    
Pension Plan [Member] | Private Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value 0    
Pension Plan [Member] | Private Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input, Transfers, Net [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 20,000,000 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 3,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 17,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0    
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value 20,000,000    
Other Postretirement Benefit Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) $ (7,000,000) $ (7,000,000) $ (7,000,000)
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Defined Benefit Plan Weighted Average Allocation Percentage of Asset Equity Securities 25.00% 25.00%  
Defined Benefit Plan Weighted Average Allocation Percentage of Asset Debt Securities 75.00% 75.00%  
Defined Benefit Plan Weighted Average Allocation Percentage of Asset Other 0.00% 0.00%  
Defined Benefit Plan Weighted Average Allocation Percentage of Assets 100.00% 100.00%  
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value $ (171,000,000) [5] $ (200,000,000) [6]  
Investment Payables Net of Investment Receivables 10,000,000 5  
Interest Receivables 1,000,000 1  
Defined Benefit Plan, Settlements, Benefit Obligation 0 0  
Other Postretirement Benefit Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (41,000,000) [5] (58,000,000) [6]  
Other Postretirement Benefit Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (125,000,000) (136,000,000)  
Other Postretirement Benefit Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (5,000,000) [5] (6,000,000) [6]  
Other Postretirement Benefit Plan [Member] | Short-term Investments [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (16,000,000) (13,000,000)  
Other Postretirement Benefit Plan [Member] | Short-term Investments [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value   (8,000,000)  
Other Postretirement Benefit Plan [Member] | Short-term Investments [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value $ (16,000,000) (5,000,000)  
Other Postretirement Benefit Plan [Member] | Equity Securities [Member]      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum 15.00%    
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum 45.00%    
Other Postretirement Benefit Plan [Member] | Equity Securities [Member] | Large Capitalization [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value $ (41,000,000) (49,000,000)  
Other Postretirement Benefit Plan [Member] | Equity Securities [Member] | Large Capitalization [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (41,000,000) (49,000,000)  
Other Postretirement Benefit Plan [Member] | Equity Securities [Member] | Large Capitalization [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value $ 0 0  
Other Postretirement Benefit Plan [Member] | Fixed Income Funds [Member]      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum 55.00%    
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum 85.00%    
Other Postretirement Benefit Plan [Member] | Alternative Assets [Member]      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum 0.00%    
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum 0.00%    
Other Postretirement Benefit Plan [Member] | Corporate Debt Securities [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value $ (38,000,000) (44,000,000)  
Other Postretirement Benefit Plan [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (36,000,000) (41,000,000)  
Other Postretirement Benefit Plan [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (2,000,000) (3,000,000)  
Other Postretirement Benefit Plan [Member] | Residential Mortgage Backed Securities [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (30,000,000) (25,000,000)  
Other Postretirement Benefit Plan [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (27,000,000) (22,000,000)  
Other Postretirement Benefit Plan [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (3,000,000) (3,000,000)  
Other Postretirement Benefit Plan [Member] | US Treasury Securities [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (23,000,000) (45,000,000)  
Other Postretirement Benefit Plan [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value   (1,000,000)  
Other Postretirement Benefit Plan [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (23,000,000) (44,000,000)  
Other Postretirement Benefit Plan [Member] | Foreign Government Debt Securities [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (2,000,000) (2,000,000)  
Other Postretirement Benefit Plan [Member] | Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (2,000,000) (2,000,000)  
Other Postretirement Benefit Plan [Member] | Commercial Mortgage Backed Securities [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (14,000,000) (15,000,000)  
Other Postretirement Benefit Plan [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (14,000,000) (15,000,000)  
Other Postretirement Benefit Plan [Member] | Other Fixed Income [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (7,000,000) (7,000,000)  
Other Postretirement Benefit Plan [Member] | Other Fixed Income [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (7,000,000) (7,000,000)  
UNITED STATES | Pension Plan [Member] | Equity Securities [Member] | Large Capitalization [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (512,000,000) (526,000,000)  
UNITED STATES | Pension Plan [Member] | Equity Securities [Member] | Large Capitalization [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (500,000,000) (526,000,000)  
UNITED STATES | Pension Plan [Member] | Equity Securities [Member] | Large Capitalization [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (11,000,000) 0  
UNITED STATES | Pension Plan [Member] | Equity Securities [Member] | Large Capitalization [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value (1,000,000) 0  
UNITED STATES | Pension Plan [Member] | Equity Securities [Member] | Mid Capitalization [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value   0  
UNITED STATES | Pension Plan [Member] | Equity Securities [Member] | Mid Capitalization [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value   0  
UNITED STATES | Pension Plan [Member] | Equity Securities [Member] | Mid Capitalization [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value   0  
UNITED STATES | Pension Plan [Member] | Equity Securities [Member] | Mid Capitalization [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value   0  
UNITED STATES | Pension Plan [Member] | Equity Securities [Member] | Small Capitalization [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value   0  
UNITED STATES | Pension Plan [Member] | Equity Securities [Member] | Small Capitalization [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value   0  
UNITED STATES | Pension Plan [Member] | Equity Securities [Member] | Small Capitalization [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value   0  
UNITED STATES | Pension Plan [Member] | Equity Securities [Member] | Small Capitalization [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract]      
Defined Benefit Plan Fair Value Of Plan Assets Net Of Certain Items Not Carried At Fair Value   $ 0  
Hartford Life Insurance Company [Member] | Separate Accounts [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Assets for Plan Benefits $ 4,600,000,000    
[1] Excludes approximately $67 of investment payables net of investment receivables that are excluded from this disclosure requirement because they are trade receivables in the ordinary course of business where the carrying amount approximates fair value. Also excludes approximately $27 of interest receivable.
[2] Excludes approximately $42 of investment payables net of investment receivables that are excluded from this disclosure requirement because they are trade receivables in the ordinary course of business where the carrying amount approximates fair value. Also excludes approximately $22 of interest receivable.
[3] Includes ABS, municipal bonds, and foreign bonds.
[4] Includes ABS and municipal bonds.
[5] Excludes approximately $10 of investment payables net of investment receivables that are excluded from this disclosure requirement because they are trade receivables in the ordinary course of business where the carrying amount approximates fair value. Also excludes approximately $1 of interest receivable.
[6] Excludes approximately $5 of investment payables net of investment receivables that are not carried at fair value and approximately $1 of interest receivable carried at fair value.