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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2015
Income Tax Disclosure [Abstract] |
Domestic and Foreign Components of Income Before Income Taxes | The domestic and foreign components of income before income taxes were as follows (in millions):
|  | Years Ended December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Domestic |  | $ | (1,577 | ) |  | $ | 1,415 |  |  | $ | 1,362 |
Foreign |  |  | 988 |  |  |  | 2,079 |  |  |  | 1,762 |
|  | $ | (589 | ) |  | $ | 3,494 |  |  | $ | 3,124 |
Components of Provision for Income Taxes | The components of the provision for income taxes consisted of (in millions):
|  | Years Ended December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Current: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 30 |  |  | $ | 681 |  |  | $ | 632 |
State |  |  | (58 | ) |  |  | 43 |  |  |  | 55 |
Foreign |  |  | 464 |  |  |  | 615 |  |  |  | 592 |
Total current income tax provision |  |  | 436 |  |  |  | 1,339 |  |  |  | 1,279 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | (41 | ) |  |  | (309 | ) |  |  | (157 | )
State |  |  | (38 | ) |  |  | (5 | ) |  |  | (12 | )
Foreign |  |  | (179 | ) |  |  | 14 |  |  |  | (167 | )
Total deferred income tax benefit |  |  | (258 | ) |  |  | (300 | ) |  |  | (336 | )
Total income tax provision |  | $ | 178 |  |  | $ | 1,039 |  |  | $ | 943 |
Difference Between Effective Tax Rate | The difference between the effective tax rate reflected in the provision for income taxes and the U.S. federal statutory rate was as follows (in millions):
|  | Years Ended December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Federal income tax at U.S. statutory rate |  | $ | (206 | ) |  | $ | 1,223 |  |  | $ | 1,093 |
Foreign income tax rate differential |  |  | (110 | ) |  |  | (261 | ) |  |  | (216 | )
State income tax, net of federal benefit |  |  | (4 | ) |  |  | 25 |  |  |  | 27 |
Nondeductible expenses |  |  | 528 |  |  |  | 24 |  |  |  | 26 |
Tax benefit of manufacturing deduction |  |  | (1 | ) |  |  | (37 | ) |  |  | (33 | )
Foreign dividends, net of foreign tax credits |  |  | 28 |  |  |  | 132 |  |  |  | 32 |
Tax rate change on timing differences |  |  | (45 | ) |  |  | (2 | ) |  |  | (22 | )
Change in tax reserve |  |  | 69 |  |  |  | (11 | ) |  |  | (1 | )
Prior years taxes |  |  | (47 | ) |  |  | (11 | ) |  |  | (40 | )
Foreign exchange losses |  |  | (46 | ) |  |  | 28 |  |  |  | 25 |
Change in deferred tax valuation allowance |  |  | 15 |  |  |  | (83 | ) |  |  | 40 |
Other |  |  | (3 | ) |  |  | 12 |  |  |  | 12 |
Total income tax provision |  | $ | 178 |  |  | $ | 1,039 |  |  | $ | 943 |
Significant Components of Deferred Tax Assets and Liability | Significant components of our deferred tax assets and liabilities were as follows (in millions):
|  | December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Deferred tax assets: |  |  |  |  |  |  |  |  |  |  |  |
Allowances and operating liabilities |  | $ | 491 |  |  | $ | 542 |  |  | $ | 439 |
Net operating loss carryforwards |  |  | 170 |  |  |  | 118 |  |  |  | 51 |
Postretirement benefits |  |  | 79 |  |  |  | 79 |  |  |  | 49 |
Foreign tax credit carryforwards |  |  | 166 |  |  |  | 244 |  |  |  | 300 |
Other |  |  | 21 |  |  |  | 15 |  |  |  | 39 |
|  |  | 927 |  |  |  | 998 |  |  |  | 878 |
Valuation allowance for deferred tax assets |  |  | (63 | ) |  |  | (48 | ) |  |  | (133 | )
Total deferred tax assets |  |  | 864 |  |  |  | 950 |  |  |  | 745 |
Deferred tax liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Tax over book depreciation |  |  | 277 |  |  |  | 236 |  |  |  | 306 |
Intangible assets |  |  | 1,323 |  |  |  | 1,304 |  |  |  | 1,757 |
Deferred income |  |  | 232 |  |  |  | 257 |  |  |  | 285 |
Accrued U.S. tax on unremitted earnings |  |  | 55 |  |  |  | 107 |  |  |  | 92 |
Other |  |  | 209 |  |  |  | 377 |  |  |  | 164 |
Total deferred tax liabilities |  |  | 2,096 |  |  |  | 2,281 |  |  |  | 2,604 |
Net deferred tax liability |  | $ | 1,232 |  |  | $ | 1,331 |  |  | $ | 1,859 |
Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits | A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in millions):
|  | 2015 |  |  | 2014 |  |  | 2013 |
Unrecognized tax benefit at beginning of year |  | $ | 115 |  |  | $ | 127 |  |  | $ | 128 |
Additions based on tax positions related to the current year |  |  | 83 |  |  |  | 3 |  |  |  | — |
Reductions for tax positions of prior years |  |  | (75 | ) |  |  | — |  |  |  | — |
Settlements of audits |  |  | (69 | ) |  |  | — |  |  |  | — |
Reductions for lapse of applicable statutes of limitations |  |  | (8 | ) |  |  | (15 | ) |  |  | (1 | )
Unrecognized tax benefit at end of year |  | $ | 46 |  |  | $ | 115 |  |  | $ | 127 |

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