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Reclassifications From Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Reclassifications from accumulated other comprehensive (loss) income |  |  |  |  |
Reclassifications, tax (benefit) |  | $ 59 |  |  |
Income Tax Expense (Benefit) | $ 88 |  | $ 86 | $ 127 | $ 148
Net income available to common shareholders | 210 |  | 161 | 357 | 298
Actuarial losses, net |  |  |  |  |
Reclassifications from accumulated other comprehensive (loss) income |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 5 |  | 5 | 10 | 11
Amortization of defined benefit pension and other postretirement benefits |  |  |  |  |
Reclassifications from accumulated other comprehensive (loss) income |  |  |  |  |
Reclassifications, tax (benefit) | (2) |  | (2) | (2) | (4)
Reclassifications, after tax | 3 |  | 3 | 8 | 7
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |  |
Reclassifications from accumulated other comprehensive (loss) income |  |  |  |  |
Income Tax Expense (Benefit) | 0 |  | (1) | 0 | (1)
Net income available to common shareholders | 1 |  | 2 | 1 | 2
Interest rate swaps | Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |  |
Reclassifications from accumulated other comprehensive (loss) income |  |  |  |  |
Interest expense | $ 1 |  | $ 3 | $ 1 | $ 3

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- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1377-109256 + Details
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- Definition Amount before tax of reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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