Retirement Plans (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pre-Tax Amounts Recognized in Accumulated Other Comprehensive Income/(Loss) [Abstract]
Prior service (cost)/credit		$ 17	$ 28
Net actuarial loss		(1,875)	(1,143)
Total pre-tax amounts recognized in accumulated other comprehensive income/(loss)		(1,858)	(1,115)
Total 2015 Forecast [Member]
Amounts Included In Accumulated Other Comprehensive Income/(Loss) Expected To Be Amortized Into Net Periodic Cost [Abstract]
Prior service credit - AOCI	10
Net actuarial loss - AOCI	(116)
Total amounts included in accumulated other comprehensive income expected to be amortized into net periodic cost (benefit)	(106)
Pension [Member]
Net Periodic Pension And OPEB Cost/(Benefit) [Line Items]
Pension & OPEB Descriptions		Pension Plans – We provide defined benefit retirement income to eligible non-union employees through qualified and non-qualified (supplemental) pension plans. Qualified and non-qualified pension benefits are based on years of service and the highest compensation during the latest years of employment, with specific reductions made for early retirements.
Projected Benefit Obligation [Abstract]
Projected benefit obligation at beginning of year		3,372	3,591
Service cost		70	72	54
Interest cost		158	134	141
Actuarial loss/(gain)		735	(257)
Gross benefits paid		(193)	(168)
Projected benefit obligation at end of year		4,142	3,372	3,591
Plan Assets [Abstract]
Fair value of plan assets at beginning of year		3,429	2,875
Actual return on plan assets		185	506
Voluntary funded pension plan contributions		200	200
Non-qualified plan benefit contributions		33	16
Gross benefits paid		(193)	(168)
Fair value of plan assets at end of year		3,654	3,429	2,875
Defined Benefit Plan, Funded Status of Plan [Abstract]
Funded status at end of year		(488)	57
Amounts Recognized in the Statement of Financial Position [Abstract]
Amounts recognized - noncurrent assets		1	364
Amounts recognized - current liabilities		(19)	(16)
Amounts recognized - noncurrent liabilities		(470)	(291)
Net amounts recognized at end of year		(488)	57
Pre-Tax Amounts Recognized in Accumulated Other Comprehensive Income/(Loss) [Abstract]
Prior service (cost)/credit		0	0
Net actuarial loss		(1,727)	(1,018)
Total pre-tax amounts recognized in accumulated other comprehensive income/(loss)		(1,727)	(1,018)
Other Pre-Tax Changes Recognized In Other Comprehensive Income/(Loss) [Abstract]
Net actuarial (loss)/gain - OCI		(780)	561	(265)
Amortization of prior service cost/(credit) - OCI		0	0	1
Amortization of actuarial loss - OCI		71	106	83
Total other pre-tax changes recognized in other comprehensive income		(709)	667	(181)
Pension [Member] \| Total 2015 Forecast [Member]
Amounts Included In Accumulated Other Comprehensive Income/(Loss) Expected To Be Amortized Into Net Periodic Cost [Abstract]
Prior service credit - AOCI	0
Net actuarial loss - AOCI	(103)
Total amounts included in accumulated other comprehensive income expected to be amortized into net periodic cost (benefit)	(103)
OPEB [Member]
Net Periodic Pension And OPEB Cost/(Benefit) [Line Items]
Pension & OPEB Descriptions		Other Postretirement Benefits (OPEB) – We provide medical and life insurance benefits for eligible retirees. These benefits are funded as medical claims and life insurance premiums are paid.
Projected Benefit Obligation [Abstract]
Projected benefit obligation at beginning of year		330	372
Service cost		2	3	3
Interest cost		14	12	15
Actuarial loss/(gain)		33	(34)
Gross benefits paid		(25)	(23)
Projected benefit obligation at end of year		354	330	372
Plan Assets [Abstract]
Fair value of plan assets at beginning of year		0	0
Actual return on plan assets		0	0
Non-qualified plan benefit contributions - OPEB		25	23
Gross benefits paid		(25)	(23)
Fair value of plan assets at end of year		0	0	0
Defined Benefit Plan, Funded Status of Plan [Abstract]
Funded status at end of year		(354)	(330)
Amounts Recognized in the Statement of Financial Position [Abstract]
Amounts recognized - noncurrent assets		0	0
Amounts recognized - current liabilities		(23)	(25)
Amounts recognized - noncurrent liabilities		(331)	(305)
Net amounts recognized at end of year		(354)	(330)
Pre-Tax Amounts Recognized in Accumulated Other Comprehensive Income/(Loss) [Abstract]
Prior service (cost)/credit		17	28
Net actuarial loss		(148)	(125)
Total pre-tax amounts recognized in accumulated other comprehensive income/(loss)		(131)	(97)
Other Pre-Tax Changes Recognized In Other Comprehensive Income/(Loss) [Abstract]
Net actuarial (loss)/gain - OCI		(33)	34	(42)
Amortization of prior service cost/(credit) - OCI		(11)	(16)	(18)
Amortization of actuarial loss - OCI		10	15	13
Total other pre-tax changes recognized in other comprehensive income		(34)	33	(47)
OPEB [Member] \| Total 2015 Forecast [Member]
Amounts Included In Accumulated Other Comprehensive Income/(Loss) Expected To Be Amortized Into Net Periodic Cost [Abstract]
Prior service credit - AOCI	10
Net actuarial loss - AOCI	(13)
Total amounts included in accumulated other comprehensive income expected to be amortized into net periodic cost (benefit)	$ (3)

The amount of contributions made by the employer that were non-qualified.

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The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

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The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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-Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost)

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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total.

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Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation).

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The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan.

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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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The increase in the fair value of plan assets from contributions made by the employer.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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-Glossary Service Cost (Component of Net Periodic Pension Cost)

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General information regarding defined benefit plans. A defined benefit pension plan is a plan that defines an amount of pension benefit to be provided, usually as a function of one or more factors such as age, years of service, or compensation. An other postretirement defined benefit plan is an arrangement that is mutually understood by an employer and its employees, whereby an employer undertakes to provide its employees with benefits other than pensions, after they retire in exchange for their services over a specified period of time, upon attaining a specified age while in service, or a combination of both. Any plan that is not a defined contribution plan is a defined benefit plan. General descriptive information about the employer's defined benefit plans, including employee groups covered, type of benefit formula, type of benefits, cost sharing arrangements, funding policy, types of assets held, and significant nonbenefit liabilities, if any. Also includes information pertaining to multiple employer plans, which are accounted for as single-employer plans.

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Amount before tax of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) related to pension and other postretirement benefit plans.

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Amount before tax, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.

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Amount before tax of (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit.

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