Pension, OPEB and Savings Plans (Fair Value Measurements And The Levels Of Inputs Used In Determining Fair Values) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 5,435		$ 4,610
Temporary Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	93		67
Common Stocks Commingled - US [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,264		1,928
Common Stocks Commingled - International [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,016		839
Common Stocks Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	704		431
Commingled Bonds - US [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Government (US & Foreign) Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	596		623
Other Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	737		691
Private Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	25		31
Quoted Market Prices for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,036		3,198
Quoted Market Prices for Identical Assets (Level 1) [Member] | Temporary Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	52	[1]	0	[1]
Quoted Market Prices for Identical Assets (Level 1) [Member] | Common Stocks Commingled - US [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,264	[2]	1,928	[2]
Quoted Market Prices for Identical Assets (Level 1) [Member] | Common Stocks Commingled - International [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,016	[2]	839	[2]
Quoted Market Prices for Identical Assets (Level 1) [Member] | Common Stocks Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	704	[2]	431	[2]
Quoted Market Prices for Identical Assets (Level 1) [Member] | Government (US & Foreign) Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[3]	0	[3]
Quoted Market Prices for Identical Assets (Level 1) [Member] | Other Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[3]	0	[3]
Quoted Market Prices for Identical Assets (Level 1) [Member] | Private Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[4]	0	[4]
Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,374		1,381
Significant Other Observable Inputs (Level 2) [Member] | Temporary Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	41	[1]	67	[1]
Significant Other Observable Inputs (Level 2) [Member] | Common Stocks Commingled - US [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[2]	0	[2]
Significant Other Observable Inputs (Level 2) [Member] | Common Stocks Commingled - International [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[2]	0	[2]
Significant Other Observable Inputs (Level 2) [Member] | Common Stocks Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[2]	0	[2]
Significant Other Observable Inputs (Level 2) [Member] | Government (US & Foreign) Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	596	[3]	623	[3]
Significant Other Observable Inputs (Level 2) [Member] | Other Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	737	[3]	691	[3]
Significant Other Observable Inputs (Level 2) [Member] | Private Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[4]	0	[4]
Pension And OPEB Plans Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	25		31
Pension And OPEB Plans Level 3 [Member] | Temporary Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Pension And OPEB Plans Level 3 [Member] | Common Stocks Commingled - US [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[2]	0	[2]
Pension And OPEB Plans Level 3 [Member] | Common Stocks Commingled - International [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[2]	0	[2]
Pension And OPEB Plans Level 3 [Member] | Common Stocks Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[2]	0	[2]
Pension And OPEB Plans Level 3 [Member] | Government (US & Foreign) Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[3]	0	[3]
Pension And OPEB Plans Level 3 [Member] | Other Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[3]	0	[3]
Pension And OPEB Plans Level 3 [Member] | Pooled Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			0		36
Pension And OPEB Plans Level 3 [Member] | Private Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 25	[4]	$ 31	[4]	$ 37

[1] Certain open-ended mutual funds with mainly short-term investments are valued based on unadjusted quoted prices in active market (Level 1). Certain temporary investments are valued using inputs such as time-to-maturity, coupon rate, quality rating and current yield (Level 2).

[2] Wherever possible, fair values of equity investments in stocks and in commingled funds are derived from quoted market prices as substantially all of these instruments have active markets (primarily Level 1). Most investments in stocks are priced utilizing the principal market close price or in some cases midpoint, bid or ask price.

[3] Investments in fixed income securities including bond funds are priced using an evaluated pricing approach or the most recent exchange or quoted bid (primarily Level 2).

[4] Limited partnership interests in private equity funds are valued using significant unobservable inputs as there is little, if any, market activity. In addition, there may be transfer restrictions on private equity securities. The process for determining the fair value of such securities relied on commonly accepted valuation techniques, including the use of earnings multiples based on comparable public securities, industry-specific non-earnings-based multiples and discounted cash flow models. These inputs require significant management judgment or estimation (primarily Level 3).