Employee Retirement Benefits (Qualified Pension Plan Assets by Asset Category at Their Fair Value) (Details) (Qualified Pension Plans, Defined Benefit [Member], USD $) In Millions, unless otherwise specified																																					12 Months Ended																																																	12 Months Ended													12 Months Ended
	Dec. 31, 2013 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	Dec. 31, 2012 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	Dec. 31, 2013 Significant Other Observable Inputs (Level 2) [Member]	Dec. 31, 2012 Significant Other Observable Inputs (Level 2) [Member]	Dec. 31, 2013 Total [Member]	Dec. 31, 2012 Total [Member]	Dec. 31, 2013 Cash Equivalents [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	Dec. 31, 2012 Cash Equivalents [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	Dec. 31, 2013 Cash Equivalents [Member] Significant Other Observable Inputs (Level 2) [Member]	Dec. 31, 2012 Cash Equivalents [Member] Significant Other Observable Inputs (Level 2) [Member]	Dec. 31, 2013 Cash Equivalents [Member] Total [Member]	Dec. 31, 2012 Cash Equivalents [Member] Total [Member]	Dec. 31, 2013 U.S. Large-Cap [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]		Dec. 31, 2012 U.S. Large-Cap [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]		Dec. 31, 2013 U.S. Large-Cap [Member] Significant Other Observable Inputs (Level 2) [Member]		Dec. 31, 2012 U.S. Large-Cap [Member] Significant Other Observable Inputs (Level 2) [Member]		Dec. 31, 2013 U.S. Large-Cap [Member] Total [Member]		Dec. 31, 2012 U.S. Large-Cap [Member] Total [Member]		Dec. 31, 2013 U.S. Mid/Small Cap [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]		Dec. 31, 2012 U.S. Mid/Small Cap [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]		Dec. 31, 2013 U.S. Mid/Small Cap [Member] Significant Other Observable Inputs (Level 2) [Member]		Dec. 31, 2012 U.S. Mid/Small Cap [Member] Significant Other Observable Inputs (Level 2) [Member]		Dec. 31, 2013 U.S. Mid/Small Cap [Member] Total [Member]		Dec. 31, 2012 U.S. Mid/Small Cap [Member] Total [Member]		Dec. 31, 2012 International [Member] securities	Dec. 31, 2013 International [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]		Dec. 31, 2012 International [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]		Dec. 31, 2013 International [Member] Significant Other Observable Inputs (Level 2) [Member]		Dec. 31, 2012 International [Member] Significant Other Observable Inputs (Level 2) [Member]		Dec. 31, 2013 International [Member] Total [Member]		Dec. 31, 2012 International [Member] Total [Member]		Dec. 31, 2013 Long-term U.S. investment grade corporate bond fund [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]		Dec. 31, 2012 Long-term U.S. investment grade corporate bond fund [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]		Dec. 31, 2013 Long-term U.S. investment grade corporate bond fund [Member] Significant Other Observable Inputs (Level 2) [Member]		Dec. 31, 2012 Long-term U.S. investment grade corporate bond fund [Member] Significant Other Observable Inputs (Level 2) [Member]		Dec. 31, 2013 Long-term U.S. investment grade corporate bond fund [Member] Total [Member]		Dec. 31, 2012 Long-term U.S. investment grade corporate bond fund [Member] Total [Member]		Dec. 31, 2013 Long-term U.S. government bond fund [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]		Dec. 31, 2012 Long-term U.S. government bond fund [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]		Dec. 31, 2013 Long-term U.S. government bond fund [Member] Significant Other Observable Inputs (Level 2) [Member]		Dec. 31, 2012 Long-term U.S. government bond fund [Member] Significant Other Observable Inputs (Level 2) [Member]		Dec. 31, 2013 Long-term U.S. government bond fund [Member] Total [Member]		Dec. 31, 2012 Long-term U.S. government bond fund [Member] Total [Member]		Dec. 31, 2013 Long-term U.S. government / credit bond fund [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]		Dec. 31, 2012 Long-term U.S. government / credit bond fund [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]		Dec. 31, 2013 Long-term U.S. government / credit bond fund [Member] Significant Other Observable Inputs (Level 2) [Member]		Dec. 31, 2012 Long-term U.S. government / credit bond fund [Member] Significant Other Observable Inputs (Level 2) [Member]		Dec. 31, 2013 Long-term U.S. government / credit bond fund [Member] Total [Member]		Dec. 31, 2012 Long-term U.S. government / credit bond fund [Member] Total [Member]		Dec. 31, 2012 Investment Grade Credit [Member] securities	Dec. 31, 2013 Investment Grade Credit [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]		Dec. 31, 2012 Investment Grade Credit [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]		Dec. 31, 2013 Investment Grade Credit [Member] Significant Other Observable Inputs (Level 2) [Member]		Dec. 31, 2012 Investment Grade Credit [Member] Significant Other Observable Inputs (Level 2) [Member]		Dec. 31, 2013 Investment Grade Credit [Member] Total [Member]		Dec. 31, 2012 Investment Grade Credit [Member] Total [Member]		Dec. 31, 2012 International Investment Grade Credit Fixed Income Securities [Member]	Dec. 31, 2012 Minimum [Member] International [Member] countries	Dec. 31, 2012 United Kingdom International [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Plan assets at fair value	$ 1,318	$ 510	$ 6	$ 717	$ 1,324	$ 1,227	$ 0	$ 0	$ 6	$ 16	$ 6	$ 16	$ 0	[1]	$ 405	[1]	$ 0	[1]	$ 0	[1]	$ 0	[1]	$ 405	[1]	$ 0	[2]	$ 105	[2]	$ 0	[2]	$ 0	[2]	$ 0	[2]	$ 105	[2]		$ 0	[3]	$ 0	[3]	$ 0	[3]	$ 215	[3]	$ 0	[3]	$ 215	[3]	$ 927	[4]	$ 0	[4]	$ 0	[4]	$ 0	[4]	$ 927	[4]	$ 0	[4]	$ 257	[5]	$ 0	[5]	$ 0	[5]	$ 0	[5]	$ 257	[5]	$ 0	[5]	$ 134	[6]	$ 0	[6]	$ 0	[6]	$ 0	[6]	$ 134	[6]	$ 0	[6]		$ 0	[7]	$ 0	[7]	$ 0	[7]	$ 486	[7]	$ 0	[7]	$ 486	[7]
Number of investments																																					6,100																																																	3,600
Number of countries in which investment involved																																																																																																				40
Percentage of fund assets																																																																																																			19.00%		15.00%

[1] Consists of a publicly traded equity index fund that tracks the S&P 500.

[2] Consists of a publicly traded equity index fund that tracks all regularly traded U.S. stocks except those in the S&P 500.

[3] Consists of an international equity fund that tracks an index of approximately 6,100 securities across over 40 countries. United Kingdom has the largest share with 15%.

[4] This mutual fund’s objective is to track the performance of the Barclays US Long Credit A/Better Index.

[5] This mutual fund’s objective is to track the performance of the Barclays U.S. Treasury STRIPS 20-30 Year Equal Par Bond Index.

[6] This mutual fund’s objective is to track the performance of the Barclays US Long Government/Credit Float Adjusted Index.

[7] Consists of a bond fund that tracks a broadly diversified investment grade index that consists of approximately 3,600 issuances of investment grade bonds from diverse industries. International markets represent 19% of the fund.