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Financial Instruments, Derivatives and Hedging Activities - Interest rate hedging (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Financial instruments, derivatives and hedging activities |  |
Accumulated gains (losses) from derivative instruments, net of tax effect | $ (1,214) | $ (1,154)
4.625% senior notes due November 1, 2020 |  |
Financial instruments, derivatives and hedging activities |  |
Debt, face amount | 400 |
Treasury Lock |  |
Financial instruments, derivatives and hedging activities |  |
Derivative notional amount | 0 | 0
Cash Flow Hedging | Treasury Lock |  |
Financial instruments, derivatives and hedging activities |  |
Accumulated gains (losses) from derivative instruments, net of tax effect | (1) | (2)
Tax effect on gain (loss) of derivative instruments | 1 | 1
Fair Value Hedging | Interest Rate Swap |  |
Financial instruments, derivatives and hedging activities |  |
Increase (decrease) in fair value of instrument | 2 | $ (1)
Fair Value Hedging | Interest Rate Swap | 4.625% senior notes due November 1, 2020 |  |
Financial instruments, derivatives and hedging activities |  |
Debt, face amount | $ 200 |
Debt, fixed interest rate (as a percent) | 4.625% |
Debt, floating rate of interest basis | six-month U.S. dollar London Interbank Offered Rate (“LIBOR”) |

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- Definition Total tax effect of the accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. The change includes an entity's share of an equity investee's increase or decrease in deferred hedging gains or losses. + References No definition available. + 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=118930883&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=118930883&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=118930883&loc=d3e681-108580 + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Amount of unrealized gain (loss) related to the fair value of interest rate derivatives designated as fair value hedging instruments, as offset by the gain (loss) on the hedged item to the extent that the fair value hedge is determined to be effective. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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