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Stockholders' Equity - Changes in Each Component of AOCI of the Parent (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance, |  | $ (1,362) |  |
Other comprehensive income (loss): |  |  |  |
Balance, |  | (1,328) |  |
Accounting Standards Update 2016-01 [Member] |  |  |  |
Other comprehensive income (loss): |  |  |  |
Adoption of ASU 2016-01 financial instruments adjustment, January 1, 2018 |  |  |  | $ 0
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance, |  | (721) | $ (670) |
Other comprehensive income (loss): |  |  |  |
Currency translation adjustments |  | 24 | 14 |
Holding loss on net investment hedge |  |  | (5) |
Tax (expense) benefit |  |  |  |
Other comprehensive income (loss) |  | 24 | 9 |
Balance, |  | (697) | (661) |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance, |  | (54) | (64) |
Other comprehensive income (loss): |  |  |  |
Holding gains and losses |  | 29 | (38) |
Reclassification of amount to net income | [1] | (24) | 29 |
Tax (expense) benefit |  |  | 1 |
Other comprehensive income (loss) |  | 5 | (8) |
Balance, |  | (49) | (72) |
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance, |  | 0 | 2 |
Other comprehensive income (loss): |  |  |  |
Holding gains and losses |  |  |  |
Reclassification of amount to net income | [1] |  |  |
Tax (expense) benefit |  |  |  |
Other comprehensive income (loss) |  | 0 | 0 |
Balance, |  | 0 | 0 |
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Accounting Standards Update 2016-01 [Member] |  |  |  |
Other comprehensive income (loss): |  |  |  |
Adoption of ASU 2016-01 financial instruments adjustment, January 1, 2018 |  |  |  | (2)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance, |  | (587) | (610) |
Other comprehensive income (loss): |  |  |  |
Reclassification adjustment for net actuarial losses included in net periodic benefit cost | [2] | 7 | 9 |
Tax (expense) benefit |  | (2) | (2) |
Other comprehensive income (loss) |  | 5 | 7 |
Balance, |  | (582) | (603) |
AOCI Attributable to Parent [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance, |  | (1,362) | (1,342) |
Other comprehensive income (loss): |  |  |  |
Currency translation adjustments |  | 24 | 14 |
Holding loss on net investment hedge |  |  | (5) |
Holding gains and losses |  | 29 | (38) |
Reclassification of amount to net income | [1] | (24) | 29 |
Reclassification adjustment for net actuarial losses included in net periodic benefit cost | [2] | 7 | 9 |
Tax (expense) benefit |  | (2) | (1) |
Other comprehensive income (loss) |  | 34 | 8 |
Balance, |  | $ (1,328) | $ (1,336) |
AOCI Attributable to Parent [Member] | Accounting Standards Update 2016-01 [Member] |  |  |  |
Other comprehensive income (loss): |  |  |  |
Adoption of ASU 2016-01 financial instruments adjustment, January 1, 2018 |  |  |  | $ (2)
[1] | Realized gains and losses from currency-related forward contracts associated with forecasted transactions or from other derivative instruments treated as cash flow hedges are reclassified from AOCI into the same line item in the consolidated statement of operations in which the underlying forecasted transaction or other hedged item is recorded. See Note 15 for additional details.
[2] | See Note 12 for additional details.

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: 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 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e681-108580 + Details
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