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Schedule II - Condensed Financial Information, Statements of Cash Flows (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Cash Flows from Operating Activities        
Shareholders' net income $ 806 $ 813 $ 1,721 $ 1,411
Adjustments to reconcile shareholders' net income to net cash provided by (used in) operating activities:        
Other liabilities     (246) (159)
Other, net     (33) 48
Net cash provided by (used in) operating activities     3,020 2,276
Cash Flows from Investing Activities        
Short term investments purchased     (501) (444)
Net cash provided by (used in) investing activities     (1,799) (732)
Cash Flows from Financing Activities        
Net change in short-term debt     (5) (14)
Repayment of long-term debt     (131) (250)
Issuance of common stock     27 76
Repurchase of common stock     (310) (895)
Other, net     (103) (13)
Net cash provided by (used in) financing activities     (542) (1,143)
Net increase (decrease) in cash and cash equivalents     662 426
Cash and cash equivalents, January 1,     2,972 3,185
Cash and cash equivalents, June 30, $ 3,634 $ 3,611 $ 3,634 $ 3,611