Employee Benefit Plans (Net Periodic Defined Benefit Cost) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Postretirement Benefit Plan
Service cost	$ 0	$ 0
Interest cost	4	4	5
Expected return on plan assets	(4)	(3)	(4)
Amortization of transition obligation	4	4	4
Amortization of prior service cost (credit)	1	1	1
Amortization of net loss	1	1	1
Net periodic benefit cost	6	7	7
Actual return on plan assets	3	4	7
Actual rate of return on plan assets, percentage	5.00%	5.65%	10.74%
Weighted-average assumptions, discount rate, percent	4.95%	5.41%	6.20%
Weighted-average assumptions, expected long-term return on plan assets, percent	5.00%	5.00%	5.00%
Healthcare cost trend rate assumed for next year, percent	8.00%	8.00%	8.00%
Rate to which the healthcare cost trend rate is assumed to decline (the ultimate trend rate), percent	5.00%	5.00%	5.00%
Year when healthcare cost trend rate reaches the ultimate trend rate	2031	2030	2028
Pension Plans, Defined Benefit [Member]
Net periodic benefit cost	47	30	57
Qualified Defined Benefit Pension Plan [Member] \| Pension Plans, Defined Benefit [Member]
Service cost	29	28	28
Interest cost	76	73	69
Expected return on plan assets	(115)	(116)	(104)
Amortization of prior service cost (credit)	4	6	6
Amortization of net loss	34	25	38
Recognition of special agreement benefits	0	0	0
Net periodic benefit cost	28	16	37
Actual return on plan assets	92	172	200
Actual rate of return on plan assets, percentage	5.85%	13.10%	17.35%
Weighted-average assumptions, discount rate, percent	5.51%	5.92%	6.03%
Weighted-average assumptions, expected long-term return on plan assets, percent	7.75%	8.00%	8.25%
Weighted-average assumptions, rate of compensation increase, percent	4.00%	3.50%	4.00%
Non-Qualified Defined Benefit Pension Plan [Member] \| Pension Plans, Defined Benefit [Member]
Service cost	3	3	4
Interest cost	11	9	9
Expected return on plan assets	0	0	0
Amortization of prior service cost (credit)	(2)	(2)	(2)
Amortization of net loss	7	4	5
Recognition of special agreement benefits	0	0	4
Net periodic benefit cost	19	14	20
Actual return on plan assets	$ 0	$ 0	$ 0
Weighted-average assumptions, discount rate, percent	5.51%	5.92%	6.03%
Weighted-average assumptions, rate of compensation increase, percent	4.00%	3.50%	4.00%

The rate of return on plan assets reflecting the average rate of earnings on the funds invested during the period.

No definition available.

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- Definition

The year assumed when the ultimate health care cost trend rate is expected to be reached in determining benefit cost.

+ References

No definition available.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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

-URI http://asc.fasb.org/extlink&oid=6504226

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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

-URI http://asc.fasb.org/extlink&oid=6504192

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

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- Definition

The amount of gains or losses recognized in net periodic benefit cost.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

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- Definition

The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

+ References

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-Publisher FASB

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-Number 132R

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- Definition

The amount of the transition obligation or asset recognized in net periodic benefit cost.

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- Definition

The interest rate used to adjust for the time value of money.

+ References

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- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ References

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- Definition

Expected rate of compensation increases (for pay-related plans).

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-Number 132R

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- Definition

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- Definition

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

+ References

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-Number 132R

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Health Care Cost Trend Rate

-URI http://asc.fasb.org/extlink&oid=6514820

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- Definition

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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- Definition

The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

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- Definition

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.

+ References

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-Publisher FASB

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

-URI http://asc.fasb.org/extlink&oid=6525008

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- Definition

The amount of increase related to special termination benefits offered to and accepted by employees in connection with their termination of employment that are only offered for a short period of time. A situation involving termination benefits may also involve a curtailment.

+ References

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- Definition

The ultimate trend rate for health care costs.

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