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Equity (Tables)
 9 Months Ended
Sep. 30, 2020
Equity [Abstract]  
Schedule of Stockholders Equity [Table Text Block] The activity in equity during the three and nine-month periods ended September 30, 2020 and 2019 was as follows (dollars in millions, except per share amounts):
Common StockAccumulated
Other
Comprehensive
Loss		Retained
Earnings
SharesAmountTotal
Balances as of December 31, 201989,387,124 $1,220 $(10)$1,381 $2,591 
Issuances of shares pursuant to equity-based plans77,397 — — — — 
Other comprehensive income— — 1 — 1 
Dividends declared ($0.3850 per share)
— — — (35)(35)
Net income— — — 81 81 
Balances as of March 31, 202089,464,521 1,220 (9)1,427 2,638 
Issuances of shares pursuant to equity-based plans42,430 1 — — 1 
Stock-based compensation— 3 — — 3 
Dividends declared ($0.3850 per share)
— — — (35)(35)
Net income— — — 39 39 
Balances as of June 30, 202089,506,951 1,224 (9)1,431 2,646 
Issuances of shares pursuant to equity-based plans2,832 — — — — 
Stock-based compensation— 2 — — 2 
Dividends declared ($0.4075 per share)
— — — (36)(36)
Net income (loss)— — — (17)(17)
Balances as of September 30, 202089,509,783 $1,226 $(9)$1,378 $2,595 
Common StockAccumulated
Other
Comprehensive
Loss		Retained
Earnings
SharesAmountTotal
Balances as of December 31, 201889,267,959 $1,212 $(7)$1,301 $2,506 
Issuances of shares pursuant to equity-based plans88,352 — — — — 
Other comprehensive income— — 1 — 1 
Dividends declared ($0.3625 per share)
— — — (32)(32)
Net income— — — 73 73 
Reclassification of stranded tax effects due to Tax Reform— — (2)2 — 
Balances as of March 31, 201989,356,311 1,212 (8)1,344 2,548 
Issuances of shares pursuant to equity-based plans15,249 1 — — 1 
Stock-based compensation— 2 — — 2 
Other comprehensive income— — 1 — 1 
Dividends declared ($0.3850 per share)
— — — (35)(35)
Net income— — — 25 25 
Balances as of June 30, 201989,371,560 1,215 (7)1,334 2,542 
Issuances of shares pursuant to equity-based plans414 — — — — 
Stock-based compensation— 2 — — 2 
Dividends declared ($0.3850 per share)
— — — (35)(35)
Net income— — — 55 55 
Balances as of September 30, 201989,371,974 $1,217 $(7)$1,354 $2,564