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Schedule I - Condensed Statements of Cash Flows (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Operating activities:      
Net income $ 1,358 $ 1,091 $ 971
Changes in operating assets and liabilities:      
Net cash provided by operating activities 2,149 2,260 2,942
Investing activities:      
Net cash used in investing activities (1,603) (2,006) (2,103)
Financing activities:      
Payments related to employee stock option plans (61) (71) (59)
Repurchase of common stock (992) (1,168) (406)
Net cash used in financing activities (382) (329) (1,235)
Increase in cash and cash equivalents 160 (150) (448)
Cash and cash equivalents at beginning of period 1,216 1,366 1,814
Cash and cash equivalents at end of period 1,376 1,216 1,366
Parent Company      
Operating activities:      
Net income 1,358 1,091 966
Adjustments to reconcile net income to cash provided by operating activities:      
Equity in earnings of subsidiary (1,358) (1,091) (966)
Changes in operating assets and liabilities:      
Other operating assets and liabilities 0 1 (1)
Net cash provided by operating activities 0 1 (1)
Investing activities:      
Investment in subsidiary, net of dividends received 1,052 1,238 467
Net cash used in investing activities 1,052 1,238 467
Financing activities:      
Payments related to employee stock option plans (61) (71) (59)
Repurchase of common stock (992) (1,168) (406)
Intercompany with subsidiary 1 0 0
Net cash used in financing activities (1,052) (1,239) (465)
Increase in cash and cash equivalents 0 0 1
Cash and cash equivalents at beginning of period 2 2 1
Cash and cash equivalents at end of period $ 2 $ 2 $ 2