Employee Benefit Plans Level 4 Defined Benefit Plan, Information about Plan Assets (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2014		Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Projected Benefit Obligation	$ 5,516,000,000		$ 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	5,515,000,000		6,024,000,000
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Fair Value of Plan Assets	4,630,000,000		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	(59,000,000)
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	391,000,000				280,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(6,000,000)
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	224,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(86,000,000)
Defined Benefit Plan, Transfers Between Measurement Levels	37,000,000
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	12,000,000				3,000,000
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
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(3,000,000)
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	2,000,000				3,000,000
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, Sales	(1,000,000)
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	4,000,000				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, Purchases	2,000,000
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	(4,000,000)
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	12,000,000				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	10,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(3,000,000)
Defined Benefit Plan, Transfers Between Measurement Levels	1,000,000
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	(55,000,000)
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	361,000,000				263,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(6,000,000)
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	200,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(79,000,000)
Defined Benefit Plan, Transfers Between Measurement Levels	36,000,000
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	3,000,000				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	3,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	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				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, Purchases	3,000,000
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
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	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
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, Sales	0
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	6,000,000				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	6,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	0
Pension Plan [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan Weighted Average Allocation Percentage of Asset Equity Securities	23.00%		21.00%
Defined Benefit Plan Weighted Average Allocation Percentage of Asset Debt Securities	57.00%		62.00%
Defined Benefit Plan Weighted Average Allocation Percentage of Asset Other	20.00%		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	4,642,000,000	[1]	(4,727,000,000)	[2]
Investment Payables Net of Investment Receivables	34,000,000		42,000,000
Interest Receivables	22,000,000		22,000,000
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Accumulated Benefit Obligation	5,515,000,000		6,024,000,000
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	582,000,000	[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			(238,000,000)
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	3,669,000,000	[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	391,000,000		257,000,000
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
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales			(193,000,000)
Defined Benefit Plan, Transfers Between Measurement Levels			44,000,000
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	391,000,000	[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	377,000,000		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	13,000,000		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	364,000,000		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			10.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum			25.00%
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			25.00%
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	902,000,000		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			(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	890,000,000		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	12,000,000		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)			0
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			(5,000,000)
Defined Benefit Plan, Transfers Between Measurement Levels			20,000,000
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	12,000,000		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	158,000,000		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]
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	156,000,000		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	2,000,000		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)			7,000,000
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			17,000,000
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	2,000,000		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	933,000,000		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	10,000,000		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	922,000,000		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	1,000,000		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	46,000,000		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	42,000,000		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	4,000,000		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			2,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales			(2,000,000)
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	4,000,000		5,000,000
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	197,000,000		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	196,000,000		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	1,000,000		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	95,000,000	[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			(9,000,000)
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	85,000,000	[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	12,000,000		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)			(5,000,000)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases			6,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales			(2,000,000)
Defined Benefit Plan, Transfers Between Measurement Levels			7,000,000
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	10,000,000	[3]	4,000,000	[4]
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	860,000,000		(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			(224,000,000)
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	499,000,000		(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	361,000,000		181,000,000
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
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales			(183,000,000)
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	361,000,000		(181,000,000)
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan Weighted Average Allocation Percentage of Asset Equity Securities	31.00%		25.00%
Defined Benefit Plan Weighted Average Allocation Percentage of Asset Debt Securities	68.00%		75.00%
Defined Benefit Plan Weighted Average Allocation Percentage of Asset Other	1.00%		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	217,000,000	[5]	200,000,000	[6]
Investment Payables Net of Investment Receivables	5,000,000		5,000,000
Interest Receivables	1,000,000		1,000,000
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			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	217,000,000	[5]	136,000,000	[6]
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			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	10,000,000		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	10,000,000		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			35.00%
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	66,000,000		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			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	66,000,000		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			65.00%
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	55,000,000		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	55,000,000		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			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	19,000,000		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	19,000,000		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
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	38,000,000		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	38,000,000		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	1,000,000		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	1,000,000		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	24,000,000		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	24,000,000		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	4,000,000		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	4,000,000		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	514,000,000		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	0		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	514,000,000		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	0		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	50,000,000
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	50,000,000
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	50,000,000
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	50,000,000
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
International [Member] | Pension Plan [Member] | Equity 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	460,000,000		438,000,000
International [Member] | 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	459,000,000		435,000,000
International [Member] | 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	1,000,000		3,000,000
International [Member] | 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
Hartford Life Insurance Company [Member] | Separate Accounts [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assets for Plan Benefits			$ 4,900,000,000

[1] Excludes approximately $34 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.

[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 and municipal bonds.

[4] Includes ABS, municipal bonds, and foreign bonds.

[5] 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.

[6] Excludes approximately $5 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.