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Supplemental Financial Information - Amounts Reclassified out of AOCI (Details) - Reclassification out of Accumulated Other Comprehensive Income - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Net actuarial losses of defined benefit plans |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassified from other comprehensive income (loss), before tax | [1] | $ 20 | $ 25 | $ 43 | $ 59
Tax Effect |  | (5) | (8) | (10) | (19)
Recognized within Net income, net of taxes |  | 15 | 17 | 33 | 40
Prior service credit of defined benefit plans |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassified from other comprehensive income (loss), before tax | [1] | (1) | (1) | (3) | (4)
Tax Effect |  | 0 | 0 | 0 | 1
Recognized within Net income, net of taxes |  | $ (1) | $ (1) | $ (3) | $ (3)
[1] | Detailed in Note 6.

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