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Accumulated Other Comprehensive Income (Loss) - Income (Expense) Effect of Reclassifications (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Affected Line Item on the Statements of Income [Line Items] |  |  |  |
Other Income (Expense) - net | $ 234 | $ (68) | $ 191 | $ (77)
Interest Expense | (235) | (222) | (474) | (439)
Income Taxes | (142) | (76) | (259) | (205)
Amounts Reclassified From Accumulated Other Comprehensive Income [Member] |  |  |  |
Affected Line Item on the Statements of Income [Line Items] |  |  |  |
Total After-tax | (16) | (58) | (64) | (89)
Qualifying Derivatives [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member] |  |  |  |
Affected Line Item on the Statements of Income [Line Items] |  |  |  |
Total Pre-tax | 22 | (32) | 8 | (31)
Income Taxes | (3) | 7 | (1) | 7
Total After-tax | 19 | (25) | 7 | (24)
Qualifying Derivatives [Member] | Interest Rate Swaps [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member] |  |  |  |
Affected Line Item on the Statements of Income [Line Items] |  |  |  |
Interest Expense | (2) | (2) | (4) | (5)
Qualifying Derivatives [Member] | Cross Currency Swaps [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member] |  |  |  |
Affected Line Item on the Statements of Income [Line Items] |  |  |  |
Other Income (Expense) - net | 24 | (29) | 12 | (26)
Interest Expense | 0 | (1) | 0 | 0
Equity Investees Accumulated Other Comprehensive Income [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member] |  |  |  |
Affected Line Item on the Statements of Income [Line Items] |  |  |  |
Other Income (Expense) - net | 0 | (1) | 0 | (1)
Total Pre-tax | 0 | (1) | 0 | (1)
Income Taxes | 0 | 0 | 0 | 0
Total After-tax | 0 | (1) | 0 | (1)
Defined Benefit Plans [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member] |  |  |  |
Affected Line Item on the Statements of Income [Line Items] |  |  |  |
Total Pre-tax | (44) | (41) | (89) | (82)
Income Taxes | 9 | 9 | 18 | 18
Total After-tax | (35) | (32) | (71) | (64)
Defined Benefit Plans [Member] | Prior Service Costs [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member] |  |  |  |
Affected Line Item on the Statements of Income [Line Items] |  |  |  |
Total Pre-tax | (1) | (1) | (1) | (1)
Defined Benefit Plans [Member] | Net Actuarial Loss [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member] |  |  |  |
Affected Line Item on the Statements of Income [Line Items] |  |  |  |
Total Pre-tax | $ (43) | $ (40) | $ (88) | $ (81)

X
- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount after tax of income (loss) from continuing operations including portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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