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Benefit Plans (Amounts Recorded in Accumulated Other Comprehensive Losses) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Accumulated other comprehensive losses | $ (3,280) | $ (2,682) | $ (1,378) | $ (2,040)
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Accumulated other comprehensive losses | (2,010) | (2,040) | $ (1,273) | $ (2,414)
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Net loss | (3,501) | (3,582) |  |
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Prior service (cost) credit | 209 | 241 |  |
Accumulated Defined Benefit Plans Adjustment, Net Deferred Tax Impact [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Deferred income taxes | 1,282 | 1,301 |  |
Pension [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Accumulated other comprehensive losses | (1,726) | (1,623) |  |
Pension [Member] | Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Net loss | (2,805) | (2,637) |  |
Pension [Member] | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Prior service (cost) credit | (22) | (23) |  |
Pension [Member] | Accumulated Defined Benefit Plans Adjustment, Net Deferred Tax Impact [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Deferred income taxes | 1,101 | 1,037 |  |
Postretirement Benefit Plan [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Accumulated other comprehensive losses | (216) | (341) |  |
Postretirement Benefit Plan [Member] | Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Net loss | (588) | (823) |  |
Postretirement Benefit Plan [Member] | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Prior service (cost) credit | 231 | 264 |  |
Postretirement Benefit Plan [Member] | Accumulated Defined Benefit Plans Adjustment, Net Deferred Tax Impact [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Deferred income taxes | 141 | 218 |  |
Postemployment Benefit Plans [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Accumulated other comprehensive losses | (68) | (76) |  |
Postemployment Benefit Plans [Member] | Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Net loss | (108) | (122) |  |
Postemployment Benefit Plans [Member] | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Prior service (cost) credit | 0 | 0 |  |
Postemployment Benefit Plans [Member] | Accumulated Defined Benefit Plans Adjustment, Net Deferred Tax Impact [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Deferred income taxes | $ 40 | $ 46 |  |

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