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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Statement of Comprehensive Income [Abstract] |  |
Net income | $ 1,174 | $ 1,217
Net actuarial losses of defined benefit plans: |  |
Adjustments, net of tax effect of ($3) and $1 | 9 | (2)
Recognized within net income, net of tax effect of ($2) and ($3) | 8 | 10
Available-for-sale investments: |  |
Unrealized gains, net of tax effect of $0 and $0 | 2 | 0
Other comprehensive income (loss), net of taxes | 19 | 8
Total comprehensive income | $ 1,193 | $ 1,225

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