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Schedule II - Condensed Financial Information, Statements of Cash Flows (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash Flows from Operating Activities    
Shareholders' net income $ 915 $ 598
Adjustments to reconcile shareholders' net income to net cash provided by (used in) operating activities:    
Other liabilities (191) (186)
Other, net (42) (31)
Net cash provided by (used in) operating activities 2,025 1,579
Cash Flows from Investing Activities    
Short term investments purchased (206) (256)
Net cash provided by (used in) investing activities (1,700) (117)
Cash Flows from Financing Activities    
Net change in short-term debt (3) (10)
Repayment of long-term debt (131) (250)
Issuance of common stock 20 38
Repurchase of common stock (310) (239)
Other, net (92) (43)
Net cash provided by (used in) financing activities (530) (515)
Net increase (decrease) in cash and cash equivalents (201) 970
Cash and cash equivalents, January 1, 2,972 3,185
Cash and cash equivalents, March 31, $ 2,771 $ 4,155