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Accumulated Other Comprehensive Loss - Schedule of AOCI Components (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
AOCI Attributable to Parent, Net of Tax |  |
Beginning balance | $ 13,687 | $ 12,530
Ending balance | 12,911 | 12,322
AOCI beginning balance, tax effect | (1,492) | (1,400)
Changes in value, tax effect | (1) | (2)
Reclassifications into retained earnings, tax effect |  | (61)
Reclassifications into earnings, tax effect | 19 | 15
AOCI ending balance, tax effect | (1,474) | (1,448)
Accumulated Other Comprehensive Income |  |
AOCI Attributable to Parent, Net of Tax |  |
Beginning balance | (7,825) | (7,621)
Changes in value (net of tax effect) | (2) | (7)
Reclassifications into retained earnings (net of tax effect) |  | (106)
Reclassifications into earnings (net of tax effect) | 61 | 53
Ending balance | (7,766) | (7,681)
Pension and Other Benefit Liabilities |  |
AOCI Attributable to Parent, Net of Tax |  |
Beginning balance | (7,925) | (7,812)
Changes in value (net of tax effect) | 0 | 0
Reclassifications into retained earnings (net of tax effect) |  | 0
Reclassifications into earnings (net of tax effect) | 60 | 51
Ending balance | (7,865) | (7,761)
Deferred income taxes related to pension obligation | 688 | 688
Derivative Contracts and Other |  |
AOCI Attributable to Parent, Net of Tax |  |
Beginning balance | 100 |
Changes in value (net of tax effect) | (2) |
Reclassifications into earnings (net of tax effect) | 1 |
Ending balance | 99 |
Derivative Contracts and Other |  |
AOCI Attributable to Parent, Net of Tax |  |
Beginning balance |  | 85
Changes in value (net of tax effect) |  | (7)
Reclassifications into retained earnings (net of tax effect) |  | 0
Reclassifications into earnings (net of tax effect) |  | 2
Ending balance |  | 80
Available-for-Sale Investments |  |
AOCI Attributable to Parent, Net of Tax |  |
Beginning balance | 0 | 106
Changes in value (net of tax effect) | 0 | 0
Reclassifications into retained earnings (net of tax effect) |  | (106)
Reclassifications into earnings (net of tax effect) | 0 | 0
Ending balance | $ 0 | $ 0

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- Definition Amount of deferred income tax expense (benefit) directly related to pension obligation, pertaining to income (loss) from continuing operations. + References No definition available. + Details
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- Definition Reclassification From Accumulated Other Comprehensive Income To Retained Earnings, Adoption Of Accounting Standard, Net Of Tax + References No definition available. + Details
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- Definition Reclassification From Accumulated Other Comprehensive Income To Retained Earnings, Adoption Of Accounting Standard, Tax + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109228884&loc=d3e1436-108581 + Details
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