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Condensed Financial Information of Registrant - Condensed Statements Of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net cash provided by operating activities | $ 1,234 | $ 1,489 | $ 1,851
Cash flows from investing activities: |  |  |
Purchases of investments | (3,846) | (2,656) | (2,432)
Sales and maturities of investments | 1,991 | 1,862 | 1,566
Investments in acquisitions | (2,055) | (50) | (1,297)
Other investing activities, net | 0 | 12 | 0
Net cash used in investing activities | (4,585) | (1,254) | (2,469)
Cash flows from financing activities: |  |  |
Proceeds from the issuance of common stock | 2,779 | 0 | 0
Proceeds from borrowings | 6,077 | 1,400 | 8,946
Payment of long-term debt | (4,083) | (1,353) | (6,076)
Common stock repurchases | (71) | (65) | (63)
Debt issue costs | (25) | (3) | (76)
Purchase of noncontrolling interest | (74) | (66) | (14)
Other financing activities, net | 9 | 5 | 0
Net cash provided by (used in) financing activities | 4,612 | (82) | 2,717
Cash and cash equivalents, beginning of period | 4,072 |  |
Cash and cash equivalents, end of period | 5,342 | 4,072 |
Parent Company |  |  |
Dividends from subsidiaries, return on investment | 464 | 292 | 25
Other operating activities, net | (317) | (132) | (71)
Net cash provided by operating activities | 147 | 160 | (46)
Cash flows from investing activities: |  |  |
Capital contributions to subsidiaries | (681) | (339) | (691)
Purchases of investments | (23) | (38) | (112)
Sales and maturities of investments | 7 | 4 | 169
Dividends from subsidiaries, return of investment | 11 | 28 | 100
Investments in acquisitions | (4,226) | (59) | (2,248)
Intercompany activities | 215 | 322 | (575)
Other investing activities, net | 0 | (1) | 0
Net cash used in investing activities | (4,697) | (83) | (3,357)
Cash flows from financing activities: |  |  |
Proceeds from the issuance of common stock | 2,778 | 0 | 0
Proceeds from borrowings | 6,014 | 1,400 | 8,934
Payment of long-term debt | (4,080) | (1,350) | (5,377)
Common stock repurchases | (71) | (65) | (63)
Debt issue costs | (25) | 0 | (76)
Purchase of noncontrolling interest | (76) | (66) | (14)
Other financing activities, net | 10 | 5 | 0
Net cash provided by (used in) financing activities | 4,550 | (76) | 3,404
Net increase in cash and cash equivalents | 0 | 1 | 1
Cash and cash equivalents, beginning of period | 6 | 5 | 4
Cash and cash equivalents, end of period | $ 6 | $ 6 | $ 5

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