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Equity, Income Tax Effects on Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Tax Effects Related to Components of Other Comprehensive Income |  |  |
Foreign currency translation adjustment, before-tax amount | $ (98) | $ 164 | $ (122)
Pension and other postretirement benefits: |  |  |
Net actuarial gain (loss) arising during the year, before-tax amount | 367 | (228) | (285)
Plan amendments, before tax amount | 371 |  |
Prior service cost arising during the year, before tax amount |  | (9) | (4)
(Gain) loss reclassified into income related to: |  |  |
Net actuarial loss, before-tax amount | 57 | 34 | 14
Prior service credit, before-tax amount | (33) | (20) | (21)
Settlement, before-tax amount | 1 | 12 | 4
Net gain (loss) on pension and other postretirement benefits, before tax amount | 763 | (211) | (292)
Derivative instruments designated and qualifying as cash flow hedges: |  |  |
Net gain (loss) arising during the year, before-tax amount | (4) | 45 | 32
Net (gain) loss reclassified into income, before-tax amount | 2 | (73) | (3)
Net gain (loss) on derivative instruments designated and qualifying as cash flow hedges, before-tax amount | (2) | (28) | 29
Other comprehensive income (loss) before tax amount | 663 | (75) | (385)
Foreign currency translation adjustment, tax expense (benefit) | 0 | 0 | 0
Pension and other postretirement benefits: |  |  |
Net actuarial gain (loss) arising during the year, tax expense (benefit) | 125 | (79) | (100)
Plan amendments, tax benefit | 130 |  |
Prior service cost, tax benefit |  | (3) | (1)
(Gain) loss reclassified into income related to: |  |  |
Amortization of net actuarial loss, tax expense | 20 | 12 | 4
Amortization of prior service credit, tax benefit | (12) | (7) | (7)
Settlement, tax expense | 0 | 0 | 1
Net gain (loss) on pension and other postretirement benefits, tax expense (benefit) | 263 | (77) | (103)
Derivative instruments designated and qualifying as cash flow hedges: |  |  |
Net gain (loss) arising during the year, tax expense (benefit) | (2) | 16 | 11
Net (gain) loss reclassified into income, tax expense (benefit) | 1 | (26) | (1)
Net gain (loss) on cash flow hedges, tax expense (benefit) | (1) | (10) | 10
Other comprehensive income (loss) tax expense (benefit) | 262 | (87) | (93)
Foreign currency translation adjustment, net | (98) | 164 | (122)
Pension and other postretirement benefits: |  |  |
Net actuarial gain (loss) arising during the year, net | 242 | (149) | (185)
Plan amendments, net | 241 |  |
Prior service cost, net |  | (6) | (3)
(Gain) loss reclassified into income related to: |  |  |
Amortization of net actuarial loss, net | 37 | 22 | 10
Amortization of prior service credit, net | (21) | (13) | (14)
Settlement, net | 1 | 12 | 3
Net gain (loss) on pension and other postretirement benefits, net | (500) | 134 | 189
Derivative instruments designated and qualifying as cash flow hedges: |  |  |
Net gain (loss) arising during the year, net | (2) | 29 | 21
Net (gain) loss reclassified into income, net | 1 | (47) | (2)
Net gain (loss) on cash flow hedges, net | (1) | (18) | 19
Other comprehensive income (loss) | $ 401 | $ 12 | $ (292)

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