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Income Taxes - Reconciliation of income taxes at the statutory rate to the provision for income taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |
Earnings before income taxes (“EBT”) | $ 260 | $ 205 | $ 434 | $ 428
Income taxes at statutory rate | 54 | 72 | 91 | 150
Effect of stock-based compensation | (2) | (7) | (7) | (13)
Effect of tax exempt interest | (4) | (6) | (7) | (12)
Effect of dividends received deduction | (1) | (2) | (2) | (4)
Effect of employee stock ownership plan dividends paid deduction | (1) | (2) | (1) | (2)
Effect of foreign operations | 0 | 0 | 3 | 6
Effect of nondeductible expenses | 2 | 1 | 4 | 3
Effect of change in valuation allowance | 2 | 2 | 2 | 0
Effect of other income tax reconciliation | 2 | 2 | 2 | 0
Provision for income taxes as shown on the Statement of Earnings | $ 52 | $ 60 | $ 85 | $ 128
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |
Income taxes at statutory rate as a percentage of EBT | 21.00% | 35.00% | 21.00% | 35.00%
Effect of stock-based compensation as a percentage of EBT | (1.00%) | (3.00%) | (2.00%) | (3.00%)
Effect of tax exempt interest as a percentage of EBT | (2.00%) | (3.00%) | (2.00%) | (3.00%)
Effect of dividends received deduction as a percentage of EBT | (0.00%) | (1.00%) | (0.00%) | (1.00%)
Effect of employee stock ownership plan dividends paid deduction as a percentage of EBT | (0.00%) | (1.00%) | (0.00%) | (0.00%)
Effect of foreign operations as a percentage of EBT | 0.00% | 0.00% | 1.00% | 1.00%
Effect of nondeductible expenses as a percentage of EBT | 1.00% | 0.00% | 1.00% | 1.00%
Effect of change in valuation allowance as a percentage of EBT | 1.00% | 1.00% | 0.00% | 0.00%
Effect of other income tax reconciliation as a percentage of EBT | 0.00% | 1.00% | 1.00% | 0.00%
Provision for income taxes as shown on the Statement of Earnings as a percentage of EBT | 20.00% | 29.00% | 20.00% | 30.00%

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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